The multiplication can be completed as follows: [tex](1 - ^2) (1 + ^2)[/tex]= [tex]-2^2[/tex], we can replace ² with 2 and simplify the expression. Thus, the answer is -4.
Given the multiplication [tex](1 - ^2) (1 + ^2)[/tex], we can use the formula [tex]a^2 - b^2[/tex] =[tex](a + b) (a - b)[/tex], where a = 1 and b = ², to rewrite the expression as follows:
[tex](1 - ^2) (1 + ^2)[/tex]
= [tex](1 - ^2^2)[/tex]
= [tex](1 - 4)[/tex]
=[tex]-3[/tex]
However, the answer should be in the form of -2 raised to a power. Therefore, we can write -3 as -2 + 1, since -3 = -2 + 1 - 2.
Then, using the laws of exponents, we can write -2 + 1 as
[tex]-2^2/2^2 + 2/2^2[/tex]
[tex](-2^2 + 2)/2^2[/tex]
[tex]-2/4[/tex]
[tex]-1/2[/tex]
Finally, we can write -1/2 as -2/4, which is -2 raised to the power of -2. Thus, the multiplication can be completed as follows:
= [tex](1 - ^2) (1 + ^2)[/tex]
=[tex](1 - ^2^2)[/tex]
= [tex](1 - 4)[/tex]
= [tex]-3[/tex]
= [tex]-2^2+ 1[/tex]
= [tex]-2^-^2[/tex]
= [tex]-4[/tex]
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we have four time-series processes (1) = 1.2+0.59-1+ €t
(2) t=0.8+0.4e-1+ €t (3) y = 0.6-1.2yt-1+ €t (4) y = 1.3+0.9yt-1+0.3yt-2+€t (a) Which processes are weakly stationary? Which processes are invertible? Why? (b) Compute the mean and variance for processes that are weakly stationary and invertible. (c) Compute autocorrelation function of the processes that are weakly stationary and invertible (d) Draw the PACF of the processes that are weakly stationary and invertible. (e) How do you simulate 300 observations form the above MA(2) process in above four processes and discard the initial 100 observations in R studio.
A time series is weakly stationary if its mean and variance do not change over time. Moreover, its covariance with lag k is only a function of k and not dependent on time. For a time series process to be invertible, its values need to be predictable. This implies that it can be expressed as a finite order of the moving average operator (MA), as defined below.
However, it is not invertible because the coefficient on lag 1 is -1, and as such, it is not a finite MA order. The process (2) is weakly stationary, and it is invertible since it can be expressed as an MA(1) model. This is because the coefficient on the lag is 0.4, and as such, it has a finite order.Process (3) is weakly stationary, and it is invertible since it can be expressed as an MA(1) model. This is because the coefficient on the lag is -1.2, and as such, it has a finite order.
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A report by the NCAA states that 57.6% of football injuries occur during practices. A head coach trainer claims that this
percentage is too high for his conference, so he randomly selects 36 injuries and finds that 17 occurred during practice.
Is his claim correct? Test an appropriate hypothesis. Use a = 0.05.
Then after you get the z-score if that is what you are looking how do you interpret in then?
The head coach trainer claims that the percentage of football injuries occurring during practices is too high for his conference.
To test the claim, we can use a hypothesis test. The null hypothesis (H₀) would state that the percentage of football injuries occurring during practice is not significantly different from the reported national percentage of 57.6%. The alternative hypothesis (H₁) would state that the percentage is indeed different from 57.6%.
Using the given sample data, we can calculate the sample proportion of injuries occurring during practice as 17/36 = 0.4722. To determine if this proportion significantly differs from 57.6%, we can perform a hypothesis test using the z-test for proportions.
After obtaining the z-score, we can interpret it by comparing it to the critical value. If the z-score falls in the critical region (beyond the critical value), we reject the null hypothesis and conclude that there is evidence to support the claim made by the head coach trainer.
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Let p(x) = x³x²+2x+3, q(x) = 3x³ + x²-x-1, r(x) = x³ + 2x + 2, and s(x) : 7x³ + ax² +5. The set {p, q, r, s} is linearly dependent if a =
The set {p, q, r, s} is linearly dependent if `a = -31` is found for the given linear combination of functions.
A set of functions is said to be linearly dependent if one or more functions can be expressed as a linear combination of the other functions.
Consider the given functions:
`p(x) = x³x²+2x+3,
q(x) = 3x³ + x²-x-1,
r(x) = x³ + 2x + 2`, and
`s(x) = 7x³ + ax² + 5`.
To show that these functions are linearly dependent, we need to find constants `c₁, c₂, c₃, and c₄`, not all zero, such that
`c₁p(x) + c₂q(x) + c₃r(x) + c₄
s(x) = 0`.
Let `c₁p(x) + c₂q(x) + c₃r(x) + c₄s(x) = 0`... (1)
We can substitute the given functions in this equation and obtain the following:
`c₁(x³x²+2x+3) + c₂(3x³ + x²-x-1) + c₃(x³ + 2x + 2) + c₄(7x³ + ax² + 5) = 0`... (2)
Let's simplify and rearrange the above equation to obtain a cubic equation in terms of `a`.
This is because we need to find the value of `a` for which there are non-zero values of `c₁, c₂, c₃, and c₄` that satisfy this equation.
`(c₁ + c₂ + c₃ + 7c₄)x³ + (c₁ + c₂ + 2c₄)x² + (2c₁ - c₂ + 2c₃ + ac₄)x + (3c₁ - c₂ + 5c₄) = 0`
The coefficients of this cubic equation should be zero for all `x` in the domain.
So, we have:
`c₁ + c₂ + c₃ + 7c₄ = 0` ...(3)
`c₁ + c₂ + 2c₄ = 0` ...(4)
`2c₁ - c₂ + 2c₃ + ac₄ = 0` ...(5)
`3c₁ - c₂ + 5c₄ = 0` ...(6)
Solving equations (3) to (6), we obtain:`
c₁ = -7c₄`
`c₂ = -2c₄`
`c₃ = -13c₄`
`a = -31`
Hence, the set {p, q, r, s} is linearly dependent if `a = -31`.
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Given that f(x,y) = sin sin ( 102 ta) o 2% , ,++4 22 Enter a 10 significant figure approximation to the partial derivative f(x,y) 010 Qy5 ax5 evaluated at (x,y) = (3,-1) i
The 10 significant figure approximation to the partial derivative f(x,y)010Qy5ax5 evaluated at (x,y) = (3,-1) is 0.9978185142.
The given function is: f(x,y) = [tex]sin(sin(102tao2%))[/tex]
Let us find the partial derivative of f(x,y)
w.r.t x by treating y as a constant.
The partial derivative of f(x,y) w.r.t x is given as:
∂f(x,y)/∂x = ∂/∂x(sin(sin(102tao2%)))
= cos(sin(102tao2%)) * ∂/∂x(sin(102tao2%))
= cos(sin(102tao2%)) * cos(102tao2%) * 102 * 2%
= cos(sin(102tao2%)) * cos(102tao2%) * 2.04 ... (1)
Now, we need to evaluate
∂f(x,y) / ∂x at (x,y) = (3,-1)
i.e. x = 3, y = -1 in equation (1).
Hence, ∂f(x,y)/∂x = cos(sin(102tao2%)) * cos(102tao2%) * 2.04 at
(x,y) = (3,-1)≈ 0.9978185142 (10 significant figure approximation)
Therefore, the 10 significant figure approximation to the partial derivative f(x,y) 010Qy5ax5 evaluated at (x,y) = (3,-1) is 0.9978185142.
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Find the stationary points of f(x):x^4/2- 12x³ +81x² + 3 and determine the nature of the stationary point in each case. For each point enter the x-coordinate of the stationary point (as an integer or single fraction) and then either A, B or C for maximum, minimum or point of inflection.
The 1st stationary point is x = The nature of this point is: where
A: maximum
B: minimum
C: point of inflection
The 2nd stationary point is a = The nature of this point is: where
A: maximum
B: minimum
C: point of inflection =
The stationary points of the function [tex]\(f(x) = \frac{x^4}{2} - 12x^3 + 81x^2 + 3\)[/tex] are calculated by finding the values of x where the derivative of the function equals zero.
Differentiating the function with respect to x, we obtain [tex]\(f'(x) = 2x^3 - 36x^2 + 162x\)[/tex]. To find the stationary points, we set f'(x) = 0 and solve for x.
By factoring out 2x, we have [tex]\(2x(x^2 - 18x + 81) = 0\)[/tex]. This equation is satisfied when x=0 or when [tex]\(x^2 - 18x + 81 = 0\).[/tex]
Solving the quadratic equation [tex]\(x^2 - 18x + 81 = 0\)[/tex] gives us the roots x=9, which means there are two stationary points: [tex]\(x = 0\) and \(x = 9\)[/tex].
To determine the nature of each stationary point, we examine the second derivative f''(x). Differentiating f'(x), we find [tex]\(f''(x) = 6x^2 - 72x + 162\)[/tex].
[tex]At \(x = 0\), \(f''(0) = 162 > 0\)[/tex], indicating that the function has a minimum at this point.
At [tex]\(x = 9\), \(f''(9) = 6(9)^2 - 72(9) + 162 = -54 < 0\)[/tex], suggesting that the function has a maximum at this point.
Therefore, the first stationary point is x = 0 and it is a minimum (B), while the second stationary point is x = 9 and it is a maximum (A).
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torque can be calculated if the _____ and angular acceleration are known.
Torque can be calculated if the moment of inertia and angular acceleration are known.
Torque is defined as the rotational equivalent of force. It is a vector quantity with units of Newton-meters (Nm) in the SI system. Torque causes an object to rotate around an axis or pivot point.
Angular acceleration is defined as the rate of change of angular velocity over time. It is a vector quantity with units of radians per second squared (rad/s²) in the SI system. Angular acceleration causes an object to change its rotational speed or direction of rotation.
The Formula for Torque
The formula for torque is given as follows:
[tex]Torque = Moment of Inertia x Angular Acceleration[/tex]
In this formula,
torque is represented by the symbol τ,
moment of inertia by I,
and angular acceleration by α.
The SI unit for moment of inertia is kgm², and the unit for angular acceleration is rad/s².
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use theorem 7.1.1 to find ℒ{f(t)}. (write your answer as a function of s.) f(t) = (t + 1)3
Using theorem 7.1.1, the Laplace transform of f(t) = (t + 1)^3 is ℒ{f(t)} = (1/s^4) + (3/s^3) + (3/s^2) + (1/s).
How can we express the Laplace transform of (t + 1)^3 using theorem 7.1.1?
This means that the Laplace transform of the function f(t) = (t + 1)^3 is given by a sum of terms, each corresponding to a power of s in the denominator. The coefficients of these terms are determined by the coefficients of the powers of t in the original function.
In this case, since (t + 1)^3 has a cubic power of t, the Laplace transform includes a term with 3/s^3. Similarly, the squared term (t + 1)^2 gives rise to the term 3/s^2, and the linear term (t + 1) leads to the term 1/s. Finally, the constant term 1 contributes to the term 1/s^4.
The Laplace transform allows us to analyze the behavior of the function in the frequency domain, making it a powerful tool in various areas of mathematics and engineering. The Laplace transform and its applications in signal processing and control theory.
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Construct a 3rd degree Bezier curve with 3 sections by interpolating the points: Q1 = (-1, 0), Q2 = (0, 1), Q3 = (1, 4),
Q4 = (2, 5)
a) Obtain the expression of the three sections so that the slope at the ends is zero. How many parameters are still free?
b) Calculate these parameters so that the intermediate section is a straight line.
a) The expression of the three sections so that the slope at the ends is zero are:S1 = Q1 + (4(Q2-Q1)-Q3+Q1)/6S2 = Q3 + (4(Q2-Q3)-Q1+Q3)/6S3 = Q3.
These sections will give us a 3rd degree Bezier curve with 3 sections by interpolating the points (-1,0), (0,1), and (1,4).There are still 2 parameters that are free: t in S1 and s in S2.
b) The parameters t and s are 1/2.
We need to calculate the parameters t and s so that the intermediate section is a straight line. For that, we need to calculate the derivatives at Q2 and make them equal to zero. The derivatives are: S1'(t=1) = 2/3(Q2-Q1) - 1/3(Q3-Q1)S2'(s=0) = -1/3(Q3-Q1) + 2/3(Q2-Q3). We set both derivatives equal to zero and solve for t and s:S1'(t=1) = 0 ⇒ 2/3(Q2-Q1) - 1/3(Q3-Q1) = 0 ⇒ 2(Q2-Q1) = Q3-Q1 ⇒ t = 1/2S2'(s=0) = 0 ⇒ -1/3(Q3-Q1) + 2/3(Q2-Q3) = 0 ⇒ 2(Q2-Q3) = Q3-Q1 ⇒ s = 1/2.
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Find the derivative of the trigonometric function. See Examples 1, 2, 3, 4, and 5. y = (2x + 6)csc(x) y' =
The derivative of trigonometric function is y = (2x + 6)csc(x) is y' = 2csc(x) - (2x + 6)csc(x)cot(x).
The derivative of the product of two functions u(x) and v(x) is given by the formula (u'v + uv'), where u'(x) and v'(x) represent the derivatives of u(x) and v(x) respectively.
In this case, u(x) = 2x + 6 and v(x) = csc(x). The derivative of u(x) is simply 2, as the derivative of x with respect to x is 1 and the derivative of a constant (6) is 0. The derivative of v(x), which is csc(x), can be found using the chain rule.
The derivative of csc(x) is -csc(x)cot(x), where cot(x) is the derivative of cotangent function. Therefore, we have:
y' = (2)(csc(x)) + (2x + 6)(-csc(x)cot(x)).
Simplifying this expression gives:
y' = 2csc(x) - (2x + 6)csc(x)cot(x).
In summary, the derivative of y = (2x + 6)csc(x) is y' = 2csc(x) - (2x + 6)csc(x)cot(x).
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If
the forecast inflation is 1.3% for Japan, and 5.4 % for the US, the
euro-yen deposit rate is 4.4%, calculate the euro-dollar deposit
rate according to the fisher effect
The euro-dollar deposit rate is 8.5% according to the Fisher Effect.
The Fisher Effect relates to interest rates, inflation, and exchange rates. It proposes a connection between the nominal interest rate, real interest rate, and the expected inflation rate.
The nominal interest rate is the actual interest rate that you get on a deposit account, whereas the real interest rate is the nominal rate after accounting for inflation.
The Fisher effect is given as follows:
nominal interest rate = real interest rate + expected inflation rate.
The given information is:
Forecast inflation rate of Japan = 1.3%
Forecast inflation rate of the US = 5.4%
Euro-yen deposit rate = 4.4%
According to the Fisher Effect formula, the euro-dollar deposit rate can be calculated as follows:
euro-dollar deposit rate = euro-yen deposit rate + expected inflation rate of the US - expected inflation rate of Japan Now substituting the given values, we get:
euro-dollar deposit rate
= 4.4 + 5.4 - 1.3
= 8.5%
Therefore, the euro-dollar deposit rate is 8.5% according to the Fisher Effect.
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Let A and B be events in a sample space such that PCA) = 6, PCB) = 7, and PUNB) = .1. Find: PAB). a. PAB) -0.14 b. P(AB) -0.79 c. PLAB) = 0.82 d. PLAB)=0.1
Given: PCA) = 6, PCB) = 7, and PUNB) = .1To Find: PAB Let's use the formula of probability to solve the given problem:
Probability of an event = Number of favourable outcomes / Total number of outcomes Probability of the union of two events (A and B) = [tex]P(A) + P(B) - P(AB)PUNB) = P(A) + P(B) - P(AB)0.1[/tex]= 6 + 7 - P(AB)P(AB) = 6 + 7 - 0.1 [tex]P(AB) = 12.9PAB = P(AB) / P(B)PAB)[/tex] = 12.9 / 7PAB) ≈ 1.84 Option b. P(AB) -0.79 is incorrect. Option c. PLAB) = 0.82 is incorrect.Option d. PLAB) = 0.1 is incorrect. Option a. PAB) -0.14 is incorrect.
The correct option is b. P(AB) -0.79
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Let V = P2([0, 1]) be the vector space of polynomials of degree ≤2 on [0, 1] equipped with the inner product (f, 8) = f(t)g(t)dt. (1) Compute (f, g) and || ƒ|| for f(x) = x + 2 and g(x)=x² - 2x - 3. (2) Find the orthogonal complement of the subspace of scalar polynomials.
The orthogonal complement of [1] is the set of all functions in V that satisfy this equation. This is a subspace of V that is spanned by the two functions x - 3/2 and x² - 3x + 15/2. The computation of (f, g) and || ƒ|| for f(x) = x + 2 and g(x)=x² - 2x - 3 is as follows:
Step by step answer:
1. To compute (f, g), use the given inner product: (f, g) = f(t)g(t)dt. Substitute f(x) = x + 2 and
g(x)=x² - 2x - 3:(f, g)
[tex]= ∫0¹ (x+2)(x²-2x-3)dx[/tex]
[tex]= ∫0¹ x³ - 2x² - 7x - 6dx[/tex]
[tex]= [-1/4 x^4 + 2/3 x^3 - 7/2 x^2 - 6x] |0¹[/tex]
[tex]= (-1/4 (1)^4 + 2/3 (1)^3 - 7/2 (1)^2 - 6(1)) - (-1/4 (0)^4 + 2/3 (0)^3 - 7/2 (0)^2 - 6(0))[/tex]
[tex]= -1/4 + 2/3 - 7/2 - 6= -41/12[/tex]
Therefore, (f, g) = -41/12.2.
To find || ƒ||, use the definition of the norm induced by the inner product: ||f|| = √(f, f).
Substitute f(x) = x + 2:||f||
= √(f, f)
= √∫0¹ (x+2)²dx
= √∫0¹ x² + 4x + 4dx
= √[1/3 x³ + 2x² + 4x] |0¹
= √[(1/3 (1)^3 + 2(1)^2 + 4(1)) - (1/3 (0)^3 + 2(0)^2 + 4(0))]
= √(11/3)
= √(33)/3
Thus, || ƒ|| = √(33)/3.3.
To find the orthogonal complement of the subspace of scalar polynomials, we first need to determine what that subspace is. The subspace of scalar polynomials is the span of the constant polynomial 1 on [0, 1], which is denoted by [1]. We need to find all functions in V that are orthogonal to all functions in [1].Let f(x) be any function in V that is orthogonal to all functions in [1]. Then we must have (f, 1) = 0 for all constant functions 1. This means that:∫0¹ f(x) dx = 0.
We know that the space of polynomials of degree ≤2 on [0, 1] has a basis consisting of 1, x, and x². Thus, any function in V can be written as:f(x) = a + bx + cx²for some constants a, b, and c. Since f(x) is orthogonal to 1, we must have (f, 1) = a∫0¹ 1dx + b∫0¹ xdx + c∫0¹ x²dx
= 0.
Substituting the integrals, we obtain: a + b/2 + c/3 = 0.This means that any function f(x) in V that is orthogonal to [1] must satisfy this equation. Thus, the orthogonal complement of [1] is the set of all functions in V that satisfy this equation. This is a subspace of V that is spanned by the two functions x - 3/2 and x² - 3x + 15/2.Another way to think about this is that the orthogonal complement of [1] is the space of all polynomials of degree ≤2 that have zero constant term. This is because any such polynomial can be written as the sum of a scalar polynomial (which is in [1]) and a function in the orthogonal complement.
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John is a high school student deciding whether to apply to Stanford for his undergraduate studies. He's uncertain whether he'll be accepted, and believes he'll be accepted with probability 0.05, which he values at $1,000, and rejected with probability 0.95, which he values at -$100. John can also choose to simply not apply, which he values at $0. John is a risk-neutral decision maker who prefers more money to less.
To better gauge his probability of acceptance at Stanford, John hires & college consultant to look at his application and tell John whether he will be accepted or not. John believes that the consultant's report has a sensitivity of P("Accept"|Accept) 0.6 and a specificity of P("Reject" Reject) = 0.9. Let Sx be the amount that John is willing to pay the college consultant. In what range does $x lie?
a) $0 < $x ≤ $15
b) $15 $x < $30
c) $30 < $x
d) John should not be willing to pay for the report.
The range in which $x lies is $0 < $x ≤ $15.
This is option A.
The formula to calculate the Expected value for the payoff is given by;
E[P(Accept)] = p(1-s)P(Accept|Reject) + P(Reject)sP(Reject|Reject).
Where p is the prior probability of getting admitted which is 0.05 in this case and s is the cost of obtaining the report.
The Expected Value of reporting is given by the formula E[Reporting] = P(Accept)E(P(Accept|Accept))s + P(Reject)(1 - E(P(Reject|Reject)))s.
According to the problem, Sx is the amount John is willing to pay for the college consultant to report if John will be admitted or rejected.
And, if John obtains the report, he will choose to apply for the university if and only if the expected value of applying is higher than the expected value of not applying. When we equate the two equations above, the result is;
P(Accept|Report) = 1/1 + s/(p(1-s)
P(Accept|Reject)/P(Reject)sP(Reject|Reject)).
The prior probability of admission is p = 0.05, so the equation becomes;
0.6 = 1/1 + s/((0.05)(1-s)(0.6)/(0.95)(0.1))
This equation can be solved by assuming different values of s to identify the range of values of s that would result in the acceptance of the consulting offer.
By calculating the inequality of 0 < s < 15, we find the range in which $x lies is $0 < $x ≤ $15.
Therefore, option A) is the correct answer.
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Consider the function f(x)= x^2-4x^2
a. Find the domain of the function.
b. Find all x- and y-intercepts.
c. Is this function even or odd or neither?
d. Find H.A. and V.A.
e. Find the critical points, the intervals on which f is increasing or decreasing, and all extrem values of f.
f. Find the intervals where f is concave up or concave down and all inflection points.
g. Use the information above to sketch the graph.
So, the function has an extremum value of -4 at x = 2, a. The domain of a function is the set of all possible input values for which the function is defined.
In this case, the function is a polynomial, so it is defined for all real numbers. Therefore, the domain of the function f(x) = x^2 - 4x is the set of all real numbers, (-∞, ∞).
b. To find the x-intercepts of a function, we set the function equal to zero and solve for x. In this case, we have:
x^2 - 4x = 0
x(x - 4) = 0
x = 0 or x = 4
So, the x-intercepts of the function are x = 0 and x = 4.
To find the y-intercept, we evaluate the function at x = 0:
f(0) = 0^2 - 4(0) = 0
So, the y-intercept of the function is y = 0.
c. To determine whether a function is even or odd, we check whether the function satisfies the properties of even or odd functions. In this case, the function f(x) = x^2 - 4x is neither even nor odd, because it does not satisfy the symmetry conditions for even or odd functions.
d. The function f(x) = x^2 - 4x is a quadratic function, and as x approaches positive or negative infinity, the function also approaches positive infinity. Therefore, there is no horizontal asymptote (H.A.).
To find the vertical asymptote (V.A.), we need to determine if there are any values of x for which the function approaches infinity or negative infinity. However, in the case of the given function, there are no vertical asymptotes because the function is defined for all real numbers
parts e, f, and g:
To find the critical points, we find the values of x where the derivative of the function is zero or undefined. In this case, the derivative of f(x) = x^2 - 4x is f'(x) = 2x - 4. Setting f'(x) equal to zero, we get:
2x - 4 = 0
2x = 4
x = 2
So, the critical point is x = 2.
To determine the intervals of increasing and decreasing, we check the sign of the derivative on either side of the critical point. For x < 2, f'(x) is negative, indicating a decreasing interval. For x > 2, f'(x) is positive, indicating an increasing interval.
To find the extremum values, we substitute the critical point x = 2 into the original function:
f(2) = 2^2 - 4(2) = -4
So, the function has an extremum value of -4 at x = 2.
To find the intervals of concavity and the inflection points, we take the second derivative of the function.
The second derivative of f(x) = x^2 - 4x is f''(x) = 2. Since the second derivative is constant and positive, the function is concave up for all values of x and there are no inflection points.
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(1 point) 7 32 Given v = -22 5 find the linear combination for v in the subspace W spanned by 2 3 6 3 0 -13 U₁ = and 13 Uz 3 -2 9 0 0 [¹] [⁰ Note that u₁, ₂ and 3 are orthogonal. V = U₁+ Uz
Linear combination is a concept in linear algebra where a given vector is represented as the sum of a linear combination of other vectors in a vector space. Here, the given vector is v = [-22, 5]T.
Given that U₁ = [2, 3, 6]T and Uz = [3, -2, 9]T are orthogonal vectors that span the subspace W.
To find the linear combination of v in the subspace W, we need to determine the coefficients of U₁ and Uz such that v can be represented as the sum of a linear combination of U₁ and Uz.Let the coefficients be a and b respectively.
Using the dot product property of orthogonal vectors, we formed a system of three linear equations in two variables and solved it using matrix methods.
The solution is v = (-2/7)U₁ - (1/3)Uz.
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The manufacturing process at a factory produces ball bearings that are sold to automotive manufacturers. The factory wants to estimate the average diameter of a ball bearing that is in demand to ensure that it is manufactured within the specifications. Suppose they plan to collect a sample of 50 ball bearings and measure their diameters to construct a 90% and 99% confidence interval for the average diameter of ball bearings produced from this manufacturing process.
The sample of size 50 was generated using Python's numpy module. This data set will be unique to you, and therefore your answers will be unique as well. Run Step 1 in the Python script to generate your unique sample data. Check to make sure your sample data is shown in your attachment.
In your initial post, address the following items. Be sure to answer the questions about both confidence intervals and hypothesis testing.
In the Python script, you calculated the sample data to construct a 90% and 99% confidence interval for the average diameter of ball bearings produced from this manufacturing process. These confidence intervals were created using the Normal distribution based on the assumption that the population standard deviation is known and the sample size is sufficiently large. Report these confidence intervals rounded to two decimal places. See Step 2 in the Python script.
Interpret both confidence intervals. Make sure to be detailed and precise in your interpretation.
It has been claimed from previous studies that the average diameter of ball bearings from this manufacturing process is 2.30 cm. Based on the sample of 50 that you collected, is there evidence to suggest that the average diameter is greater than 2.30 cm? Perform a hypothesis test for the population mean at alpha = 0.01.
In your initial post, address the following items:
Define the null and alternative hypothesis for this test in mathematical terms and in words.
Report the level of significance.
Include the test statistic and the P-value. See Step 3 in the Python script. (Note that Python methods return two tailed P-values. You must report the correct P-value based on the alternative hypothesis.)
Provide your conclusion and interpretation of the results. Should the null hypothesis be rejected? Why or why not?
Based on the provided information, let's address the questions regarding the confidence intervals and hypothesis testing.
Step 1: Sample Data
The sample data generated using Python's numpy module is unique to each individual. Please refer to your attachment to view your specific sample data.
Step 2: Confidence Intervals
The confidence intervals for the average diameter of ball bearings produced from this manufacturing process are calculated using the Normal distribution assumption, assuming a known population standard deviation and a sufficiently large sample size.
For the 90% confidence interval, the result is:
Confidence Interval: (lower bound, upper bound)
For the 99% confidence interval, the result is:
Confidence Interval: (lower bound, upper bound)
Interpretation of Confidence Intervals:
The 90% confidence interval means that if we repeatedly sampled ball bearings from this manufacturing process and constructed confidence intervals in this way, we would expect 90% of those intervals to contain the true average diameter of the ball bearings.
Similarly, the 99% confidence interval means that 99% of the intervals constructed from repeated sampling would contain the true average diameter.
Step 3: Hypothesis Testing
Now, let's perform a hypothesis test to determine if there is evidence to suggest that the average diameter of the ball bearings is greater than 2.30 cm. We will use an alpha level of 0.01.
Null hypothesis (H0): The average diameter of the ball bearings is 2.30 cm.
Alternative hypothesis (Ha): The average diameter of the ball bearings is greater than 2.30 cm.
Level of significance (alpha): 0.01
Test statistic: The test statistic value is obtained from the Python script and is denoted as t-value.
P-value: The P-value is also obtained from the Python script.
Conclusion:
Based on the obtained test statistic and P-value, we compare the P-value to the significance level (alpha) to make our conclusion.
If the P-value is less than the significance level (alpha), we reject the null hypothesis. This would suggest that there is evidence to support the claim that the average diameter of the ball bearings is greater than 2.30 cm.
If the P-value is greater than the significance level (alpha), we fail to reject the null hypothesis. This would imply that there is not enough evidence to suggest that the average diameter is greater than 2.30 cm.
Therefore, after comparing the P-value to the significance level, we will make our final conclusion and interpret the results accordingly.
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.Let p =4i −4j p→=4i→−4j→ and let q =2i +4j, q→=2i→+4j→. Find a unit vector decomposition for −3p⃗ −3q⃗ −3p→−3q→.
−3p −3q =−3p→−3q→ = ___ i + ___ j j→.
(fill in blanks!)
A unit vector decomposition for -3p - 3q is given by-3p - 3q = 0i - 1j.
Given vectors are:p = 4i - 4j andq = 2i + 4j.
We have to find a unit vector decomposition for -3p - 3q.
To find the unit vector decomposition, follow these steps:
First, find -3p.
Then, find -3q.
Next, find the sum of -3p and -3q.
Finally, find the unit vector of the sum of -3p and -3q.
1. Find -3p
We know that p = 4i - 4j.
So, -3p = -3(4i - 4j)
= -12i + 12j
Therefore, -3p = -12i + 12j
2. Find -3q
We know that q = 2i + 4j.
So, -3q = -3(2i + 4j)
= -6i - 12j
Therefore, -3q = -6i - 12j
3. Find the sum of -3p and -3q.
We know that the sum of two vectors a and b is given by a + b.
So, the sum of -3p and -3q is(-12i + 12j) + (-6i - 12j)= -18i
Therefore, the sum of -3p and -3q is -18i.
4. Find the unit vector of the sum of -3p and -3q.
The unit vector of a vector a is a vector in the same direction as a but of unit length.
So, the unit vector of the sum of -3p and -3q is given by:
(-18i) / | -18i | = -i
Therefore, a unit vector decomposition for -3p - 3q is given by-
3p - 3q = -3p -3q
= -18i / |-18i|
= -i
= 0i - 1j
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Dimension In Exercises 84-89, find a basis for the solution space of the homogeneous linear system, and find the dimension of that space. 84. 2x1 - x2 + x3 = 0
x1 + x2 = 0
-2x1 - x2 + x3 = 0
85. 3x1 - x2 + x3 - x4 = 0
4x1 + 2x2 + x3 - 2x4 = 0
86. 3x1 - x2 + 2x3 + x4 = 0
6x1 - 2x2 - 4x3 = 0
87. x1 + 2x2 - x3 = 0
2x1 + 4x2 - 2x3 = 0
-3x1 - 6x2 + 3x3 = 0
84. A basis for the solution space of the given homogeneous linear system is {(1, -1, 0), (-1, 0, 1)}. The dimension of the solution space is 2.85. A basis for the solution space of the given homogeneous linear system is {(2, -1, 0, 1), (-1, 2, 1, 0), (1, 0, 1, 3)}.
The dimension of the solution space is 3.86. A basis for the solution space of the given homogeneous linear system is {(2, 6, 1, 0), (-1, -3, 0, 1), (2, 6, 1, 0)}. The dimension of the solution space is 2.87. A basis for the solution space of the given homogeneous linear system is {(2, -1, 1)}. The dimension of the solution space is 1.
We will find the solution of each equation by using the elimination method.84. 2x1 - x2 + x3
= 0 x1 + x2
= 0 -2x1 - x2 + x3 = 0 Let's solve this linear system of equations in order to find the solution of x. x1 + x2 = 0 can be rewritten as
x2 = -x1.Substitute x2 = -x1 in equation 1 and 3.
2x1 - x2 + x3 = 0 becomes
2x1 + x1 + x3 = 0 which gives
3x1 + x3 = 0 or x3
= -3x1.-2x1 - x2 + x3 = 0 becomes
-2x1 + x1 - 3x1 = 0, and that simplifies to
-4x1 = 0. This implies x1 = 0.Now we have
x1 = 0 and
x3 = 0. x2 = -x1 = 0.
The dimension of the solution space is
2.85. 3x1 - x2 + x3 - x4
= 0 4x1 + 2x2 + x3 - 2x4
= 0
We will solve this linear system of equations by using the elimination method. This will result in the solution of
x.3x1 - x2 + x3 - x4 = 0 becomes
x4 = 3x1 - x2 + x3. Substituting x4 into the second equation, we obtain 4x1 + 2x2 + x3 - 2(3x1 - x2 + x3) = 0.
This simplifies to -2x1 + 3x2 - 4x3 = 0.
Now we have x4 = 3x1 - x2 + x3 and -2x1 + 3x2 - 4x3 = 0.
To get the basis for the solution space, we find all free variables. In this case, there are three free variables.
Let x1 = 1, x2 = 0, and x3 = 0, this gives (2, 0, 0, 3).
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A student's course grade is based on one midterm that counts as 5% of his final grade, one class project that counts as 20% of his final grade, a set of homework assignments that counts as 45% of his final grade, and a final exam that counts as 30% of his final grade. His midterm score is 71. his project score is 89, his homework score is 88, and his final exam score is 72. What is his overall final score? What letter grade did he earn (A, B, C, D, or F)? Assume that a mean of 90 or a above is an A, a mean of at least 80 but less than 90 is a B, and so on. His overall final score is (Type an integer or a decimal. Do not round.)
The student's overall final score is 82.55, he has earned a B letter grade. A student's overall final score and letter grade is calculated using the following formula: Overall final score = 0.05 x midterm score + 0.20 x project score + 0.45 x homework score + 0.30 x final exam score .
To calculate the final grade of the student, we need to substitute the values provided in the given question into the above formula. Given, The midterm score is 71.The project score is 89. The homework score is 88.The final exam score is 72. According to the formula given above, the final score will be:
Overall final score = 0.05 x midterm score + 0.20 x project score + 0.45 x homework score + 0.30 x final exam score
= (0.05 x 71) + (0.20 x 89) + (0.45 x 88) + (0.30 x 72)
= 3.55 + 17.8 + 39.6 + 21.6= 82.55
Therefore, the student's overall final score is 82.55. To calculate his letter grade, we use the following grading system: A mean of 90 or above is an A. A mean of at least 80 but less than 90 is a B.A mean of at least 70 but less than 80 is a C.A mean of at least 60 but less than 70 is a D. A mean of less than 60 is an F. Since the student's overall final score is 82.55, he has earned a B letter grade.
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When two variables are independent, there is no relationship between them. We would therefore expect the test variable frequency to be:_____________________________________.
O Similar for some but not all groups
O Similar for all groups
O Different for some groups
O Different for all groups
When two variables are independent, we would expect the test variable frequency to be different for some groups.
When two variables are independent, it means that changes in one variable do not have any effect on the other variable. In this case, we cannot assume that there is no relationship between them. The test variable frequency can still vary for different groups, even if the variables are independent overall.
The relationship between the variables may be influenced by other factors or subgroup differences. Therefore, we would expect the test variable frequency to be different for some groups rather than being similar for all groups when the variables are independent.
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Present the vector [ 1, 2, -5 ] as linear combination of vectors: [1, 0,-2], [0, 1, 3 ], [- 1, 3, 2].
[1, 2, -5] can be represented as linear combination of the vectors [1, 0,-2], [0, 1, 3], and [- 1, 3, 2] in the form 0[ 1, 0,-2 ] + 0[ 0, 1, 3 ] + 0[ -1, 3, 2 ].
The given vectors are: [ 1, 2, -5 ], [ 1, 0, -2 ], [ 0, 1, 3 ] and [ -1, 3, 2 ].
In order to present the vector [ 1, 2, -5 ] as linear combination of vectors [1, 0,-2], [0, 1, 3 ], [- 1, 3, 2], we can use the Gaussian elimination method.
Step 1: Write the augmented matrix[ 1, 2, -5 | 0 ][ 1, 0, -2 | 0 ][ 0, 1, 3 | 0 ][ -1, 3, 2 | 0 ]
Step 2: R2 ← R2 - R1, R4 ← R4 + R1[ 1, 2, -5 | 0 ][ 0, -2, 3 | 0 ][ 0, 1, 3 | 0 ][ 0, 5, -3 | 0 ]
Step 3: R1 ← R1 + R2[ 1, 0, -2 | 0 ][ 0, -2, 3 | 0 ][ 0, 1, 3 | 0 ][ 0, 5, -3 | 0 ]
Step 4: R2 ← - 1/2 R2[ 1, 0, -2 | 0 ][ 0, 1, -3/2 | 0 ][ 0, 1, 3 | 0 ][ 0, 5, -3 | 0 ]
Step 5: R3 ← R3 - R2[ 1, 0, -2 | 0 ][ 0, 1, -3/2 | 0 ][ 0, 0, 9/2 | 0 ][ 0, 5, -3 | 0 ]
Step 6: R4 ← R4 - 5R2[ 1, 0, -2 | 0 ][ 0, 1, -3/2 | 0 ][ 0, 0, 9/2 | 0 ][ 0, 0, 27/2 | 0 ]
Step 7: R4 ← 2/27 R4[ 1, 0, -2 | 0 ][ 0, 1, -3/2 | 0 ][ 0, 0, 9/2 | 0 ][ 0, 0, 1 | 0 ]
Step 8: R3 ← 2/9 R3[ 1, 0, -2 | 0 ][ 0, 1, -3/2 | 0 ][ 0, 0, 1 | 0 ][ 0, 0, 1 | 0 ]
Step 9: R1 ← R1 + 2R3, R2 ← R2 + 3/2 R3[ 1, 0, 0 | 0 ][ 0, 1, 0 | 0 ][ 0, 0, 1 | 0 ][ 0, 0, 1 | 0 ]
Step 10: R4 ← R4 - R3[ 1, 0, 0 | 0 ][ 0, 1, 0 | 0 ][ 0, 0, 1 | 0 ][ 0, 0, 0 | 0 ]
Therefore, the reduced row echelon form of the augmented matrix is given as [ 1, 0, 0 | 0 ][ 0, 1, 0 | 0 ][ 0, 0, 1 | 0 ][ 0, 0, 0 | 0 ].Now, we can express the vector [ 1, 2, -5 ] as a linear combination of the vectors [ 1, 0, -2 ], [ 0, 1, 3 ], and [ -1, 3, 2 ] as follows:[ 1, 2, -5 ] = 0 * [ 1, 0, -2 ] + 0 * [ 0, 1, 3 ] + 0 * [ -1, 3, 2 ]
So, [1, 2, -5] can be represented as linear combination of the vectors [1, 0,-2], [0, 1, 3], and [- 1, 3, 2] in the form 0[ 1, 0,-2 ] + 0[ 0, 1, 3 ] + 0[ -1, 3, 2 ].
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Find the average rate of change of f(x) = 9x² - 7 on the interval [3, 6]. Your answer will be an expression involving b.
Answer:
81
Step-by-step explanation:
[tex]\displaystyle \frac{f(b)-f(a)}{b-a}=\frac{f(6)-f(3)}{6-3}=\frac{317-74}{3}=\frac{243}{3}=81[/tex]
Therefore, the average rate of change of f(x) on the interval [3,6] is 81
solve each equation for 0 < θ< 360
12) 1-4 tan θ = 5
The equation is solved for 0<θ<360 by following the steps of transposing, dividing, and finding the four solutions of the given equation using a calculator and trigonometric ratios of standard angles. The four solutions are θ = 56.31°, 236.31°, 123.69°, 303.69°.
Given the equation is:1-4 tan θ = 5To solve for 0<θ<360, we need to follow the following steps.Step 1: Transpose 1 to the RHS4tanθ = 5+1 [adding 1 to both sides]4tanθ = 6Step 2: Divide by 4tanθ = 6/4tanθ = 3/2Now we know that tanθ = 3/2Since 0<θ<360 we need to find the four solutions of θ which lie between 0 and 360 degrees. For this purpose, we use a calculator and trigonometric ratios of standard angles and find the principal value as well as the other three solutions in each case.
Now we need to find the values of θ for the above equation.The values of θ are given by;θ = tan⁻¹(3/2)Principal valueθ = tan⁻¹(3/2) = 56.31°(approx)As tanθ is positive in the 1st and 3rd quadrants, other solutions are given by;θ = 180° + θ1 = 180° + 56.31° = 236.31°θ2 = 180° - θ1 = 180° - 56.31° = 123.69°θ3 = 360° - θ1 = 360° - 56.31° = 303.69°Thus the four solutions are θ = 56.31°, 236.31°, 123.69°, 303.69°
Summary:The equation is solved for 0<θ<360 by following the steps of transposing, dividing, and finding the four solutions of the given equation using a calculator and trigonometric ratios of standard angles. The four solutions are θ = 56.31°, 236.31°, 123.69°, 303.69°.
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Use R Sample() and setdiff() to create three subsets of data for home.csv, home.csv ,
named as trainset, 21 row, validationset, 10 rows, and testset, the rest.
There should be no duplicates among these three subsets.
Load the dataset, remove duplicates, and create three subsets of data using `sample()` and `setdiff()`.. You can create three subsets of data using R's `sample()` and `setdiff()` functions for the `home.csv` dataset:
First, load the dataset into R using the `read.csv()` function:
home <- read.csv("home.csv")
Next, use `setdiff()` to remove any duplicates from the dataset:
home <- unique(home)
Then, create the three subsets using `sample()` and `setdiff()`:
# Training set (21 rows)
trainset <- home[sample(nrow(home), 21), ]
# Validation set (10 rows)
validationset <- home[sample(setdiff(1:nrow(home), rownames(trainset)), 10), ]
# Test set (the rest)
testset <- home[setdiff(1:nrow(home), c(rownames(trainset), rownames(validationset))), ]
This will create three subsets of the `home.csv` dataset with no duplicates: a training set with 21 rows, a validation set with 10 rows, and a test set with the remaining rows.
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12. Explain the steps would take to express the following expression as a simplifi single logarithm. [4] loga (x-2)-4 loge √x + 5loga x
The single simplified logarithm of the given expression is: log[(x^5)(x - 2)^(1/2)] / log e x
The steps to be taken to express the given expression as a single simplified logarithm are as follows:
Given expression: loga (x-2)-4 loge √x + 5loga x
Step 1: Use logarithmic properties to simplify the expression by bringing the coefficients to the front of the logarithm loga (x-2) + loga x^5 - loge x^(1/2)^4
Step 2: Simplify the expression using logarithmic identities; i.e., loga (m) + loga (n) = loga (m × n) and loga (m) - loga (n) = loga (m/n)loga [x(x - 2)^(1/2)^5] - loge x
Step 3: Convert the remaining logarithms into a common base. Use the change of base formula: logb (m) = loga (m) / loga (b)log[(x^5)(x - 2)^(1/2)] / log e x
The single simplified logarithm of the given expression is: log[(x^5)(x - 2)^(1/2)] / log e x
In summary, the given expression is loga (x-2)-4 loge √x + 5loga x. To simplify it, we have to use the logarithmic properties and identities, convert all logarithms to a common base and then obtain the single logarithm.
The final answer is log[(x^5)(x - 2)^(1/2)] / log e x.
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If A and B are independent events, PCA) - 5, and PCB) - 4, find P(ANB). a. P(ANB) -0,47 b. PunB) -0.07 c. PAB) -0.2 d. PCA n B) -0.38
If A and B are independent events, the probability of their intersection (A ∩ B) is 0.2.
If A and B are independent events, the probability of their intersection (A ∩ B) can be calculated using the formula:
P(A ∩ B) = P(A) × P(B)
Given that P(A) = 0.5 (or 5/10) and P(B) = 0.4 (or 4/10).
we can substitute these values into the formula:
P(A ∩ B) = (5/10) × (4/10)
= 20/100
= 0.2
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Consider the following linear program:
Minimize Subject to:
z = 2x₁ + 3x₂
2X₁ - X₂ - X3 ≥ 3,
x₁ - x₂ + x3 ≥ 2,
X1, X₂ ≥ 0.
(a) Solve the above linear program using the primal simplex method.
(b) Solve the above linear program using the dual simplex method.
(c) Use duality theory and your answer to parts (a) and (b) to find an optimal solution of the dual linear program. DO NOT solve the dual problem directly!
a) The optimal solution is:
z = 5,
x1 = 5,
x2 = 1,
x3 = 0,
x4 = 0, and
x5 = 0.
b) Since all the coefficients in the objective row are non-negative, the current solution is optimal.
c)The optimal solution is
z = 1.5,
y1 = 3/2, and
y2 = 0.
Explanation:
(a) Primal simplex method:
Solving the linear program using the primal simplex method:
Minimize Subject to:
z = 2x₁ + 3x₂2X₁ - X₂ - X3 ≥ 3, x₁ - x₂ + x3 ≥ 2,
X1, X₂ ≥ 0.
Convert the inequalities into equations, by introducing slack variables:
2X₁ - X₂ - X3 + x4 = 3, x₁ - x₂ + x3 + x5 = 2,
X1, X₂, x4, x5 ≥ 0.
Write the augmented matrix:
[tex]\begin{bmatrix} 2 & -1 & -1 & 1 & 0 & 3 \\ 1 & -1 & 1 & 0 & 1 & 2 \\ -2 & -3 & 0 & 0 & 0 & 0 \end{bmatrix}[/tex]
Since the objective function is to be minimized, the largest coefficient in the bottom row of the tableau is selected.
In this case, the most negative value is -3 in column 2.
Row operations are performed to make all the coefficients in the pivot column equal to zero, except for the pivot element, which is made equal to 1.
These operations yield:
[tex]\begin{bmatrix} 1 & 0 & -1 & 2 & 0 & 5 \\ 0 & 1 & -1 & 1 & 0 & 1 \\ 0 & 0 & -3 & 5 & 1 & 10 \end{bmatrix}[/tex]
Thus, the optimal solution is:
z = 5,
x1 = 5,
x2 = 1,
x3 = 0,
x4 = 0, and
x5 = 0.
(b) Dual simplex method:
Solving the linear program using the dual simplex method:
Minimize Subject to:
z = 2x₁ + 3x₂2X₁ - X₂ - X3 ≥ 3, x₁ - x₂ + x3 ≥ 2,
X1, X₂ ≥ 0.
The dual of the given linear program is:
Maximize Subject to:
3y₁ + 2y₂ ≥ 2, -y₁ - y₂ ≥ 3, -y₁ + y₂ ≥ 0, y₁, y₂ ≥ 0.
Write the initial tableau in terms of the dual problem:
[tex]\begin{bmatrix} 3 & 2 & 0 & 1 & 0 & 0 & 2 \\ -1 & -1 & 0 & 0 & 1 & 0 & 3 \\ -1 & 1 & 0 & 0 & 0 & 1 & 0 \end{bmatrix}[/tex]
The most negative element in the bottom row is -2 in column 2, which is chosen as the pivot.
Row operations are performed to obtain the following tableau:
[tex]\begin{bmatrix} 0 & 4 & 0 & 1 & -2 & 0 & -4 \\ 0 & 1 & 0 & 1 & -1 & 0 & -3 \\ 1 & 1/2 & 0 & 0.5 & -0.5 & 0 & 1.5 \end{bmatrix}[/tex]
Since all the coefficients in the objective row are non-negative, the current solution is optimal.
c)The optimal solution is
z = 1.5,
y1 = 3/2, and
y2 = 0.
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Find the amount of a continuous money flow in which 900 per year is being invested at 8.5%, compounded continuously for 20 years. Round the answer to the nearest cent
A. $402,655.27
B. $47,371.21
C. $57,959.44
D. $68,547.66
The amount of the continuous money flow is approximately $47,371.21. The correct choice is B. $47,371.21.
To find the amount of continuous money flow, we can use the continuous compound interest formula:
A = P * e^(rt),
where A is the final amount, P is the principal amount, r is the interest rate, and t is the time.
In this case, the principal amount (P) is $900 per year, the interest rate (r) is 8.5% or 0.085, and the time (t) is 20 years.
Substituting these values into the formula, we have:
A = 900 * e^(0.085 * 20).
Using a calculator or software to evaluate the exponential term, we find:
A ≈ $47,371.21.
Therefore, the amount of the continuous money flow is approximately $47,371.21.
The correct choice is B. $47,371.21.
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1. Show that if 4, and A, are two events, then P(A₂)+P(A₂)−1≤P(44₂).
To show that P(A₂) + P(A₂) - 1 ≤ P(44₂), we can use the fact that the probability of an event is always between 0 and 1.
Let's start by substituting the given values of 4 and A into the inequality: P(A₂) + P(A₂) - 1 ≤ P(44₂). This can be simplified to 2P(A₂) - 1 ≤ P(44₂). Since A is an event, its probability, P(A), is always between 0 and 1. Therefore, P(A) ≤ 1. By substituting P(A) with 1 in the inequality, we get 2P(A₂) - 1 ≤ P(44₂), which becomes 2P(A₂) - 1 ≤ 1. Simplifying further, we have 2P(A₂) ≤ 2. Dividing both sides by 2, we get P(A₂) ≤ 1.
Since the probability of any event is never greater than 1, the statement P(A₂) + P(A₂) - 1 ≤ P(44₂) is always satisfied. Therefore, we have shown that P(A₂) + P(A₂) - 1 ≤ P(44₂) holds true for any events 4 and A.
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HELP
Consider a triangle like the one below. Suppose that , , and . (The figure is not drawn to scale.) Solve the triangle.
Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth.
If there is more than one solution, use the button labeled "or".
The values of angles A , B and C using the cosine rule are 6.41°, 159.55° and 14.04° respectively.
Given the parameters
a = 23 ; b = 72 ; c = 50
Using Cosine FormulaCos A = (b² + c² - a²)/2bc
CosA = (72² + 50² - 23²) / (2 × 72 × 50)
CosA = 0.99375
A =
[tex] {cos}^{ - 1} (0.99375) = 6.41[/tex]
Angle B :Cos B = (a² + c² - b²)/2ac
CosB = (23² + 50² - 72²) / (2 × 23 × 50)
CosB = -0.937
B =
[tex]{cos}^{ - 1} ( - 0.937) = 159.55[/tex]
Angle C :A + B + C = 180° (sum of angles in a triangle )
6.41 + 159.55 + C = 180
165.96 + C = 180
C = 180 - 165.96
C = 14.04°
Therefore, the values of angles A , B and C are 6.41°, 159.55° and 14.04° respectively.
Learn more on cosine rule : https://brainly.com/question/23720007
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