Kay measured herself, her shadow, and the shadow length of a nearby tree. She sketched out the picture below and wants to use it to determine the height of the tree. Calculate the height of the tree in meters. only write the number! don't round!

To find the equation of the line passing through the points (-4, -3) and (-4, 6),

we note that the x-coordinate of both points is the same, which means the line is vertical and parallel to the y-axis. In this case, the equation of the line can be written as x = a, where 'a' is the x-coordinate of any point on the line.

Since both points have an x-coordinate of -4, the equation of the line passing through them is x = -4.

Learn more about equation of the line : https://brainly.com/

Answer:

x=-4

Step-by-step explanation:

The general equation is y=mx+b where m is the slope and b is the y intercept.

Notice that there are 2 different y coordinates (-3 and 6) for the same x (-4) coordinate!

Slope = rise/run = (y2-y1)/(x2-x1) = (-3-6)/(-4--4) = -9/0 = there's NO slope, you cannot divide by zero!

So the equation is just x=-4.

See attached screenshot.

The margin of error for the 95% confidence interval is given as follows:

M = $321.

The t-distribution is used when the standard deviation for the population is not known, and the bounds of the confidence interval are given according to the equation presented as follows:

[tex]\overline{x} \pm t\frac{s}{\sqrt{n}}[/tex]

The variables of the equation are listed as follows:

The critical value, using a t-distribution calculator, for a two-tailed 95% confidence interval, with 86 - 1 = 85 df, is t = 1.9883.

The parameters are given as follows:

[tex]\overline{x} = 3600, s = 1500, n = 86[/tex]

Hence the margin of error is obtained as follows:

[tex]M = t\frac{s}{\sqrt{n}}[/tex]

[tex]M = 1.9833 \times \frac{1500}{\sqrt{86}}[/tex]

M = $321.

Learn more about the t-distribution at https://brainly.com/question/17469144

#SPJ1

If a and b are mutually exclusive, then P(A ∩ B) = 0. Therefore, we have:

P(~B ∪ ~C) = P(~B) + P(~C) - P(~B ∩ ~C)

= P(B') + P(C') - P(B' ∩ C')

= 1 - P(B) + 1 - P(C) - [1 - P(B ∪ C)]

= 2 - P(B) - P(C) - P(B ∪ C)

= 2 - 0.4 - 0.5 - P(B ∪ C)

= 1.1 - P(B ∪ C)

Also, we know that:

P(A ∪ C) = P(A) + P(C) - P(A ∩ C)

0.6 = 0.2 + 0.5 - P(A ∩ C)

P(A ∩ C) = 0.1

Now, we can use the inclusion-exclusion principle to find P(A ∪ B ∪ C):

P(A ∪ B ∪ C) = P(A) + P(B) + P(C) - P(A ∩ B) - P(A ∩ C) - P(B ∩ C) + P(A ∩ B ∩ C)

Since A and B are mutually exclusive, P(A ∩ B) = 0, and we have:

P(A ∪ B ∪ C) = P(A) + P(B) + P(C) - P(A ∩ C) - P(B ∩ C) + P(A ∩ B ∩ C)

We can write P(A ∩ B ∩ C) as:

P(A ∩ B ∩ C) = P(A) - P(A ∩ B) + P(B) - P(A ∩ B) + P(C) - P(A ∪ B ∪ C)

Since A and B are mutually exclusive, we have P(A ∩ B) = 0, and we can write:

P(A ∩ B ∩ C) = P(A) + P(B) + P(C) - 2P(A ∪ B ∪ C)

Substituting this into the equation for P(A ∪ B ∪ C), we get:

P(A ∪ B ∪ C) = P(A) + P(B) + P(C) - P(A ∩ C) - P(B ∩ C) + P(A) + P(B) + P(C) - 2P(A ∪ B ∪ C)

= 2P(A) + 2P(B) + 2P(C) - P(A ∩ C) - P(B ∩ C) - 2P(A ∪ B ∪ C)

We can rewrite P(~B ∪ ~C) as :

P(~B ∪ ~C) = P((B ∩ C)')

= 1 - P(B ∩ C)

Substituting this into the equation for P(A ∪ B ∪ C), we get:

P(A ∪ B ∪ C) = 2P(A) + 2P(B) + 2P(C) - P(A ∩ C) - P(B ∩ C) - 2[1.1 - P(~B ∪ ~C)]

= 2P(A) + 2P(B) + 2P(C) - P(A ∩ C) - P(B ∩ C) - 2.2 + 2P(B ∪ C)

= 2P(A) + 4P(B ∪ C) + 2P(C) - P(A

Learn more about principle of inclusion and exclusion here -: brainly.com/question/29355729

#SPJ11

The correct graph of amounts of water plot the measurements on a line plot is shown in image.

We have to given that;

The amounts of water plot the measurements on a line plot are,

1/8 oz, 1/8 oz, 1/4 oz, 1./4 oz, 1/4 oz, 1/2 oz, 1/2 oz , 1/2 oz, 3/4 oz, 1 oz

Now, We have;

1/8 oz is repeats two times.

1/4 oz is repeats three times.

1/2 oz is repeats two times.

3/4 oz is only one times

And, 1 oz is repeats one time.

Thus, The correct graph of amounts of water plot the measurements on a line plot is shown in image.

To learn more about Scatter Plot visit:

brainly.com/question/6592115

#SPJ1

A 1992 study of bull terriers found the following: (i) 50% of the studied bull terriers are white. (ii) 11% of the studied bull terriers are deaf. (iii) 20% of the white bull terriers are deaf. The probability that a randomly chosen bull terrier is white and deaf is 0.1, or 10%.

To find the probability that a randomly chosen bull terrier is white and deaf, we can use the given information from the study:
(i) 50% of the studied bull terriers are white (P(White) = 0.5)
(iii) 20% of the white bull terriers are deaf (P(Deaf|White) = 0.2)
Now, we can apply the conditional probability formula to find the probability of a bull terrier being both white and deaf:
P(White and Deaf) = P(Deaf|White) * P(White)
P(White and Deaf) = 0.2 * 0.5
P(White and Deaf) = 0.1

To learn more about probability, refer:-

https://brainly.com/question/32004014

#SPJ11

Answer: The value of x is 150.

Option (c) x= 150 is correct

Step-by-step explanation:

Given l1 ║ l2

let ∠1 =30°  

∠1 = ∠2 = 30° [Corresponding angle]

Then , ∠2 + ∠3 = 180° [Linear pair]

30° + x° = 180°

x° = 180° - 30°

∴ x = 150°

The correct arrangement of the areas of the figures from the least to the greatest is Y < X < Z.

The area of the figures is calculated as follows;

area of the triangle;

Area = ¹/₂ x base x height

Area = ¹/₂ x 14 m x 22.5 m

Area = 157.5 m²

area of the circle is calculated as follows;

Area = πr²

where;

Area = π x ( 7 m )²

Area = 153.94 m²

The area of the parallelogram is calculated as follows;

Area = base x height

Area = 15.5 m x 10.9 m

Area = 168.95 m²

Learn more about area here: https://brainly.com/question/25292087

#SPJ1

As the size of the house increases, the monthly cost to heat the house with natural gas also increases.Positive, meaning as the size of the house increases, the heating cost also increases.

Based on the data provided, it appears that there is a positive correlation between house size (x) and heating cost (y). As the size of the house increases, the monthly cost to heat the house with natural gas also increases.

learn more about house here :https://brainly.com/question/29451438

#SPJ11

The number of ways you serve up a coffee cup and saucer is 15 ways

From the question, we have the following parameters that can be used in our computation:

Colors = red, orange, green, light blue, dark blue, and yellow

So, we have

Colors = 6

To serve up a coffee cup and saucer, we have

n = 6

r = 2

The number of ways is calculated as

Ways = 6C2

Using the combination formula, we have

Ways = 6!/(4! * 2!)

Evaluate

Ways = 15

Hence, the number of ways is 15

Read more about combination at

https://brainly.com/question/11732255

#SPJ1

Therefore, the length of the curve for t ∈ [0, 4] is 4√13.

To find the length of the curve defined by x(t) = 2t and y(t) = 3t - 1 for t ∈ [0, 4], we can use the arc length formula:

L = ∫[a,b] √[x'(t)^2 + y'(t)^2] dt

where x'(t) and y'(t) are the derivatives of x(t) and y(t) with respect to t.

Let's calculate the derivatives first:

x'(t) = d/dt (2t) = 2

y'(t) = d/dt (3t - 1) = 3

Now, we can calculate the integrand:

√[x'(t)^2 + y'(t)^2] = √[(2)^2 + (3)^2] = √[4 + 9] = √13

Substituting the integrand into the arc length formula and integrating with respect to t from 0 to 4:

L = ∫[0,4] √13 dt

= √13 ∫[0,4] dt

= √13 [t] from 0 to 4

= √13 (4 - 0)

= 4√13

To know more about curve,

https://brainly.com/question/31482186

#SPJ11

A derangement of n objects is a permutation of the objects such that no object is in its original position. The number of derangements of n objects, dn, is given by the formula dn = n!(1/0! - 1/1! + 1/2! - 1/3! + ... + (-1)^n/n!).

For n = 1 or 2, there is only one possible derangement, which is not even. For n = 3, there are 2 possible derangements, which are both even. For n = 4, there are 9 possible derangements, which are all odd. For n = 5, there are 44 possible derangements, which are all even.

In general, integer for n > 2, dn is even if and only if n is odd.
Hello! For positive integers n, the number of derangements (dn) is even when n is odd. A derangement is a permutation where no object is in its original position. The formula for finding the number of derangements is given by dn = n! * (1 - 1/1! + 1/2! - 1/3! + ... + (-1)^n/n!). When n is odd, the last term in the series has a positive sign, causing the result to be even.

Learn more about integers here : brainly.com/question/15276410

#SPJ11

The theory behind Euler's equation and the boundary conditions for a column with one fixed end and the other end free. Therefore, the answer to the question is d) 1/2, as x = π/2L = (2(1) - 1)π/2L = (2n - 1)π/2L when n = 1/2.

Euler's equation is derived from the Euler-Bernoulli beam theory, which states that a slender column under axial compression will buckle when the compressive stress exceeds a certain critical value. The buckling load is given by the equation P= xt^2π^2Et, where P is the buckling load, x is a dimensionless factor called the slenderness ratio (the ratio of the column length to its cross-sectional dimensions), t is the thickness of the column wall, E is the modulus of elasticity of the column material, and π is the mathematical constant pi.

For a column with both ends pinned, the value of x is given by x = nπ/L, where n is an integer and L is the length of the column. For a column with one end fixed and the other end free, the value of x is given by x = (2n - 1)π/2L, where n is an integer.  In this case, we have a column with one fixed end and the other end free, so we need to use the equation x = (2n - 1)π/2L to find the value of x. Since n can be any integer, we can choose n = 1 to simplify the equation and get x = π/2L.

Substituting this value of x into Euler's equation, we get P = (π/2L)²π²Et = π²Et/4L². This means that the buckling load for a column with one fixed end and the other end free is proportional to the modulus of elasticity and inversely proportional to the square of the length of the column.

Therefore, the answer to the question is d) 1/2, as x = π/2L = (2(1) - 1)π/2L = (2n - 1)π/2L when n = 1/2

To know more about Euler's  visit:-

https://brainly.com/question/14091151

#SPJ11.

The wave has:

Period = 3.5 seconds

Frequency = 1/3.5 = 0.29

Amplitude = 42 - 26 = 16 cm

We have,

Period:

The period of a wave refers to the time it takes for one complete cycle of the wave to occur.

T = 1 / f where f represents the frequency.

Frequency:

The frequency of a wave represents the number of complete cycles or oscillations of the wave that occur in a given time period.

f = 1 / T where T represents the period.

Amplitude:

The amplitude of a wave refers to the maximum displacement or distance from the equilibrium position of a particle in the wave.

Now,

The wave has:

Period = 3.5 seconds

Frequency = 1/3.5 = 0.29

Amplitude = 42 - 26 = 16 cm

Thus,

Period = 3.5 seconds

Frequency = 1/3.5 = 0.29

Amplitude = 42 - 26 = 16 cm

Learn more about Wave Graph here:

https://brainly.com/question/29142985

#SPJ1

The shape of the two-dimensional cross section as given in the three-dimensional figures as required is; A rectangle.

It follows from the task content that the shape of the cross section as indicated is to be determined.

By observation, the cross section is a diagonal cut of a three-dimensional cuboid.

On this note, the shape of the two dimensional cross section as required is; A rectangle.

Read more on cross section;

https://brainly.com/question/28008161

#SPJ1

Everyone handed a card to everyone else, a total of 28,680 Valentine's cards were distributed.

Now, In this case, we can use the following formula to calculate the total number of Valentine's cards distributed:

⇒ n(n-1)/2

where, n is the overall attendance at the meeting.

Here, We have to given that;

n = 240.

As a result, we may enter this number in the formula:

= 240(240 - 1)/2

= 28,680

Since, Everyone handed a card to everyone else, a total of 28,680 Valentine's cards were distributed.

Learn more about the multiplication visit:

https://brainly.com/question/10873737

#SPJ1

The total surface area and the total volume will be 960 square cm and 1,440 cubic cm, respectively.

Let h be the height and b be the base of the triangle. Let L₁, L₂, and L₃ be the length and W be the width of the rectangle. Then the surface area of the triangular prism will be given as,

Surface area = 2 Area of triangle + 3 Area of rectangle

Surface area = (h x b) + (L₁ + L₂ + L₃) x W

The surface area of the triangular prism is calculated as,

SA = (24 x 10) + (10 + 24 + 26) x 12

SA = 240 + 720

SA = 960 square cm

The volume is calculated as,

V = 1/2 x 24 x 10 x 12

V = 1,440 cubic cm

More about the surface area of a triangular prism link is given below.

https://brainly.com/question/16765719

#SPJ1

The value of x as required to be determined in the given task content is; 3.

It follows from the task content that the value of x is required to be determined in the given task content.

By observation; the triangles formed by the parallel lines and the common vertex they share are similar triangles.

On this note, the ratio of their corresponding sides are equal and hence; we have that;

15 / (15 + x) = 10 / (10 + 2)

(15 × 12) = 10 (15 + x)

180 - 150 = 10x

30 = 10x

x = 3.

Consequently, it follows that the value of x as required is; 3.

Read more on similar triangles ratio;

https://brainly.com/question/31529028

#SPJ1

The formula for the volume of a sphere is:

V = (4/3)πr³

where D is the diameter, which is twice the radius (r). So we can calculate the radius as:

r = D/2 = 9.2mm/2 = 4.6mm

Now we can substitute the value of r into the formula for the volume:

V = (4/3)πr³ = (4/3)π(4.6mm)³ = 487.9mm³

Rounding this answer to the nearest tenth gives:

V ≈ 487.9mm³ ≈ 487.8mm³

Therefore, the volume of the sphere is approximately 487.8 cubic millimeters.

The function notation for the volume of the box is V(a) = (L-2a)(W-2a)(a). However, we need to know the dimensions of the paper in order to determine the volume of the box when the cutout length is 0.8 inches.

To represent the volume of the box (in cubic inches) using function notation, we can use V(a) where "a" represents the cutout length (in inches). To determine the volume of the box when the cutout length is 0.8 inches, we simply substitute 0.8 for "a" in the function V(a). However, we need to know the dimensions of the paper in order to determine the function itself.

Let's assume that the length of the paper is "L" inches and the width is "W" inches. When squares of length "x" are cut out from each corner, the length of the box will be L-2x and the width will be W-2x. The height of the box will be x inches. Therefore, the volume of the box will be V(a) = (L-2a)(W-2a)(a). Since we don't know the dimensions of the paper, we cannot determine the exact value of V(0.8).

So, the volume of the box when the cutout length is 0.8 inches is represented by the function f(0.8) = (L - 1.6)(W - 1.6)(0.8) in cubic inches.

Learn more about notation here:
https://brainly.com/question/29531272

#SPJ11

You have an SRS of six observations from a Normally distributed population, the correct answer is (c) 2.015

To obtain an 80% confidence interval for the mean µ of a Normally distributed population with a small sample size (n<30), we need to use a t-distribution with n-1 degrees of freedom. In this case, since we have an SRS of six observations, our degrees of freedom are 6-1=5. To determine the critical value for an 80% confidence interval using a t-distribution with 5 degrees of freedom, we can use a t-table or a calculator. Using a t-table, we would find the row corresponding to 5 degrees of freedom and the column for a two-tailed test with an area of 0.10 (80% divided by 2). The intersection of this row and column gives us a critical value of 2.015. Therefore, the correct answer is (c) 2.015. Alternatively, we could use a calculator that has a t-distribution function. In this case, we would enter a confidence level of 0.80, a degree of freedom of 5, and ask the calculator to output the critical value. This would also give us a critical value of 2.015.

Learn more about critical value here:

https://brainly.com/question/30168469

#SPJ11

First, we need to find the curl of F. Since the rectangle C can be divided into two regions by a horizontal line, we can split the integral into two parts.

curl(F) = (∂(x - y)/∂x - ∂(x^2 + y^2)/∂y)k

= (-2y)k

Now we can apply Green's Theorem:

∫C F·dr = ∫∫R curl(F) dA

where R is the region enclosed by C, and dA is the area element.

Since the rectangle C can be divided into two regions by a horizontal line, we can split the integral into two parts:

∫C F·dr = ∫∫R1 curl(F) dA + ∫∫R2 curl(F) dA

where R1 is the region above the line y = 4.5, and R2 is the region below.

In region R1, y > 4.5, so the curl is negative:

∫∫R1 curl(F) dA = ∫0^2 ∫4.5^9 (-2y) dy dx

= -81

In region R2, y < 4.5, so the curl is positive:

∫∫R2 curl(F) dA = ∫0^2 ∫0^4.5 (-2y) dy dx

= 81/2

Therefore, the total circulation is:

∫C F·dr = ∫∫R1 curl(F) dA + ∫∫R2 curl(F) dA

= -81 + 81/2

= -144

So the answer is D) -144.

Visit here to learn more about Green's Theorem:

brainly.com/question/30763441

#SPJ11

The given series is Σ(-1)^n (7n – 5)/(8n + 5) for n = 1 to infinity.
To apply the Alternating Series Test, we need to check if the series satisfies the following two conditions:
1) The terms of the series alternate in sign.
2) The absolute value of the terms decreases as n increases.

1) The given series alternates in sign because of the (-1)^n factor.
2) To check if the absolute value of the terms decreases as n increases, we can find the ratio of consecutive terms:

b_n = (7n – 5)/(8n + 5)
b_n+1 = (7(n+1) – 5)/(8(n+1) + 5)

So, b_n+1/b_n = [(7n+12)/(8n+13)] * [(8n+5)/(7n-5)]
= (56n^2 + 43n + 60)/(56n^2 - 41n - 65)

We can observe that the numerator is always greater than the denominator for n >= 1. Therefore, b_n+1/b_n < 1 for all n >= 1, which means that the absolute value of the terms decreases as n increases.

Since the series satisfies both conditions of the Alternating Series Test, we can conclude that the series converges.

To evaluate lim bn as n approaches infinity, we can use the fact that bn is a rational function of n. By dividing both numerator and denominator by n, we can write:

b_n = (7 - 5/n)/(8 + 5/n)

As n approaches infinity, both the numerator and denominator approach constants (7 and 8, respectively). Therefore, lim bn = 7/8.

So, the series Σ(-1)^n (7n – 5)/(8n + 5) converges to a limit of 7/8.

Learn more about  Alternating Series Test here:

https://brainly.com/question/16969349

#SPJ11

a) The greatest test score is 96.

c) 75% percent of the scores were between 71 and 96

a) The greatest test score is 96.

b) The number that arranges all numbers from large to small in the middle is called the median, and Some numbers. may have more than one of the same the numbers, so the median is not in the middle of the box.

C. 75% ( the upper limit of the box is the upper quartile and the lower quartile is the lower quartile)

d)  Half of the scores were higher than the median. From the box plot, we can see that the median is approximately 84, so half of the scores were higher than 84.

Learn more about box plot here:

https://brainly.com/question/12591498

#SPJ1

The area of the triangle is approximately 27.71 square units.

We can use the formula for the area of a triangle given two sides and the included angle:

Area = 1/2 * |u| * |v| * sin(theta)

where |u| and |v| are the magnitudes of the vectors, and theta is the angle between them.

First, we can find the magnitude of each vector:

Next, we can find the vector difference ~u - ~v:

~u - ~v = (3-6, 3-0, 3-6) = (-3, 3, -3)

Then, we can find the magnitude of ~u - ~v:

|~u - ~v| = √((-3)² + 3² + (-3)²) = 3√(2)

Now, we can find the angle between ~u and ~v using the dot product:

theta [tex]= cos^{-1(2\sqrt(6))}[/tex] ≈ 30.96 degrees

Finally, we can plug in the values to find the area:

Therefor, the area is ≈ 27.71 square units.

Learn more about dot product

brainly.com/question/31396150

#SPJ11

If it is arithmetic, find the common difference d; if it is geometric, find the common ratio r then thehe given sequence {3n - 5} is arithmetic, with a common difference of 3.

To determine whether the given sequence is arithmetic, geometric, or neither, we need to look at the pattern of the numbers. For an arithmetic sequence, there is a constant difference between each term. For example, in the sequence 2, 5, 8, 11, 14, the difference between each term is 3.

For a geometric sequence, there is a constant ratio between each term. For example, in the sequence 2, 6, 18, 54, 162, the ratio between each term is 3. Looking at the given sequence {3n - 5}, we can see that there is a common factor of n, which makes it a bit tricky to determine the pattern. However, we can still try to find a common difference or ratio by looking at the differences between terms.

Starting with the first two terms:
n=1: 3(1) - 5 = -2
n=2: 3(2) - 5 = 1

The difference between these terms is 3.
Continuing on:
n=3: 3(3) - 5 = 4
n=4: 3(4) - 5 = 7
The difference between these terms is also 3.
So we can conclude that the sequence is arithmetic, with a common difference of 3.

To know more about arithmetic visit:-

https://brainly.com/question/30620833

#SPJ11

The problem asks to find the approximate change in the value of z when the variables x and y change from (2, -1) to (2.04, -0.95), given the function z = x^2 - xy/(6y^2). Therefore, the approximate change in z is about 0.1933.

To find the rate of change of z with respect to x and y, we first need to take the partial derivatives of z with respect to each variable:

∂z/∂x = 2x - y/6y^2

∂z/∂y = -x/(3y^3) + 1/(2y)

Then, at the point (2, -1), we can evaluate these partial derivatives to find:

∂z/∂x = 2(2) - (-1)/(6(-1)^2) = 4 + 1/6

∂z/∂y = -2/(3(-1)^3) + 1/(2(-1)) = 2/3 - 1/2

Using the formula for total differential, we can approximate the change in z as:

Δz ≈ ∂z/∂x Δx + ∂z/∂y Δy

where Δx and Δy are the changes in x and y, respectively. In this case, Δx = 2.04 - 2 = 0.04 and Δy = -0.95 - (-1) = 0.05. Substituting the partial derivatives and the values for Δx and Δy, we get:

Δz ≈ (4 + 1/6)(0.04) + (2/3 - 1/2)(0.05) = 0.1933...

Therefore, the approximate change in z is about 0.1933.

Learn more about Variable:

brainly.com/question/29696241

#SPJ11

The perpendicular distance x of Mount Krasha from the road is approximately 297.33 km.

One of the most significant areas of mathematics, trigonometry has a wide range of applications.

We can solve this problem using trigonometry. Let's draw a diagram to help us visualize the situation:

Let's let the point where the direction toward Mount Krasha makes an angle of 33 degrees with the road be point A, and let the point 16 km farther along the road where the angle is 35 degrees be point B. Let's also let the perpendicular distance from Mount Krasha to the road be x.

From the diagram, we can see that:

- The distance from point A to point B along the road is 16 km.

- The angle between the road and the perpendicular line from Mount Krasha to the road is (90 - 33) = 57 degrees at point A, and (90 - 35) = 55 degrees at point B.

Using trigonometry, we can set up two equations:

```

tan(57) = x / d     (where d is the distance from the starting point to point A)

tan(55) = x / (d + 16)   (where d + 16 is the distance from the starting point to point B)

```

We want to solve for x, so we can rearrange each equation to isolate x:

```

x = d * tan(57)

x = (d + 16) * tan(55)

```

Now we can set these two equations equal to each other and solve for d:

```

d * tan(57) = (d + 16) * tan(55)

d * 1.5403 = (d + 16) * 1.4281

1.5403d = 1.4281d + 22.8496

0.1122d = 22.8496

d = 203.76 km

```

Therefore, the distance from the starting point to point A is 203.76 km. We can now substitute this value into either equation for x to solve for x:

```

x = d * tan(57)

x = 203.76 km * tan(57°)

x ≈ 297.33 km

```

Therefore, the perpendicular distance x of Mount Krasha from the road is approximately 297.33 km.

Learn more about trigonometry on:

https://brainly.com/question/13729598

#SPJ4

The given system of differential equations can be analyzed using a Lyapunov function of the form ax^2 + cy^2, where a and c are to be determined. By computing the derivative of this function along the trajectory of the system, we can determine the stability properties of the critical point at the origin.

First, we compute the derivative of the Lyapunov function along the trajectory of the system:

V'(x,y) = 2ax(x^3 + xy^2) + 2cy(xy' - 2x^2y)

Using the second equation of the system, we can substitute y' = x^3 + xy^2 - 2x^2y to obtain:

V'(x,y) = 2ax(x^3 + xy^2) + 2cy(x^3 + xy^2 - 2x^2y - 2x^2y)

Simplifying this expression yields:

V'(x,y) = 2x(x^2 + y^2)(a + c - 4ac)

For the critical point at the origin to be asymptotically stable, we need V'(x,y) to be negative definite in a neighborhood of the origin. This can be achieved by choosing a and c such that a + c - 4ac < 0 and a, c > 0. For example, we can choose a = 1/4 and c = 1/2, which gives a + c - 4ac = -1/4.

Therefore, the critical point at the origin is asymptotically stable. This means that any trajectory that starts sufficiently close to the origin will converge to the origin as t approaches infinity. The Lyapunov function provides a way to analyze the stability of the critical point without solving the system explicitly, which can be useful for more complex systems.

To learn more about equations click here: brainly.com/question/24169758

#SPJ11

We can use a two-sample t-test to determine whether there is a significant difference between the average number of hours worked per week and the average number of hours slept per week.

To determine whether people spend more time working or sleeping, we need to compare the average number of hours worked per week to the average number of hours slept per week. Since we have two groups (hours worked and hours slept), we can use a two-sample t-test to compare the means of the two groups

.

Therefore, we can use a two-sample t-test to determine whether there is a significant difference between the average number of hours worked per week and the average number of hours slept per week.

Learn more about two-sample t-test here

https://brainly.com/question/15870238

#SPJ4

Given question is incomplete, the complete question is below

Which test should I use?

Do people spend more time working or sleeping? 200 people were asked how many hours they work per week and how many hours per week they sleep

Answer:

f(-2)=31

Step-by-step explanation:

f(x)=-x²-8x+19

f(-2)=-(-2)²-8(-2)+19

=-(-2*-2)+16+19

=-4+35

=31

f(-2)=31√