whats the domain? someone pleaseee
Which of the expressions are equivalent to the one below? 3• (2 + 6) + 4.5
A. 3:2 + 3 • 6 + 4.
B. 3.2 + (6 + 4) · 5
C. 5• 4+ 3 • (6 + 2)
D. (6 + 2) • 3 + 4.5
Answer:
Option D is correct
28.5=28.5
A quality assurance check is 97% accurate for non-defective devices and 88% accurate for defective devices. Of the devices checked, 92% of devices are not defective. What is the probability of an incorrect conclusion? Round your answer to the nearest tenth of a percent.
Answer:
so 3 percent of 92 percent which is 2.76 percent
Question 1
4+ (-3) + (-2) ?
Which of the following diagrams correctly represent
Answer:
4-3-2
-1
Step-by-step explanation:
please help more than that's problem part 2
9514 1404 393
Answer:
(a) C(0, 0)
(b) D(4 2/3, 2 1/3)
(c) E(1.2, 0.6)
Step-by-step explanation:
All of these problems are similar, so let's talk about how to work them in general. The points to be found are C, D, E. For this discussion, let's say the point to be found is P.
"Similar triangles" means the triangle side lengths are proportional. When P is located some fraction from A to B, it means the horizontal triangle leg from Ax to Px is that fraction of the horizontal triangle leg from Ax to Bx. In equation form, it means ...
(Px -Ax)/(Bx -Ax) = fraction
The same is true for the vertical triangle legs:
(Py -Ay)/(By -Ay) = fraction
These equations are used to find the values of Px and Py, so the coordinates of P: (Px, Py).
__
(a) (Cx -(-2))/(6 -(-2)) = 1/4 . . . . . . . substituting known values in the above equation
Cx +2 = 8(1/4) = 2 . . . . . multiply by 8
Cx = 0 . . . . . . . . . . . . . . add -2
The y-coordinate is found the same way.
(Cy -(-1))/(3 -(-1)) = 1/4
Cy +1 = 1 . . . . . . . . . . . . . multiply by 4
Cy = 0
The point 1/4 of the way from A to B is C(0, 0).
__
(b) For this, the starting and ending points are switched, so the reference point is B, not A.
(Dx -Bx)/(Ax -Bx) = 1/6
(Dx -6)/(-2 -6) = 1/6
Dx -6 = -8/6 . . . . . . . . . . . multiply by -8
Dx = 6 -4/3 = 4 2/3 . . . . . add 6
The y-coordinate is found the same way.
(Dy -3)/(-1 -3) = 1/6
Dy -3 = -4/6 . . . . . . . . . multiply by -4
Dy = 2 1/3 . . . . . . . . . . . add 3
The point 1/6 of the way from B to A is D(4 2/3, 2 1/3).
__
(c) We assume a typo in the problem statement, so that the desired ratio is ...
AE : EB = 2 : 3
This means our point E is located 2/5 of the way from A to B.
(Ex +2)/8 = 2/5 . . . . . . using previous results, we don't have to write out and compute the difference Bx -Ax
Ex = 8(2/5) -2 = 1 1/5
And the y-coordinate is computed similarly.
(Ey +1)/4 = 2/5
Ey = 8/5 -1 = 3/5
The point E dividing the segment AB into parts in the ratio 2:3 is E(1.2, 0.6).
A pharmacist found at the end of the day she had 3/2 as many prescriptions for antibiotics as tranquilizers. She had 35 prescriptions altogether. How many did she have for tranquilizers?
Answer:
She had 14 prescriptions for tranquilizers.
Step-by-step explanation:
This question can be solved using a system of equations.
I am going to say that:
x is the number of prescriptions she had for antibiotics.
y is the number of prescriptions she had for tranquilizers.
A pharmacist found at the end of the day she had 3/2 as many prescriptions for antibiotics as tranquilizers.
This means that:
[tex]\frac{x}{y} = \frac{3}{2}[/tex]
[tex]x = \frac{3y}{2}[/tex]
She had 35 prescriptions altogether.
This means that:
[tex]x + y = 35[/tex]
How many did she have for tranquilizers?
We want to find y. Since [tex]x = \frac{3y}{2}[/tex], we solve the following equation.
[tex]x + y = 35[/tex]
[tex]\frac{3y}{2} + y = 35[/tex]
Multiplying everything by 2
[tex]3y + 2y = 70[/tex]
[tex]5y = 70[/tex]
[tex]y = \frac{70}{5}[/tex]
[tex]y = 14[/tex]
She had 14 prescriptions for tranquilizers.
Write down the exact value of:
a) cos 45°
b) sin 60°
C) tan 60°
Answer:
a)squareroot 2/2
b)squareroot 3/2
c)squareroot 3
Step-by-step explanation:
Answer:
cos45 = √2/2 = 0.707.
sin60 = √3/2 = 0.866.
tan60 = √3 = 1.732.
Step-by-step explanation:
5) (x3 – 4x2 + 9) = (x - 3)
Answer:
x=1
Step-by-step explanation:
(3x-4(2)+9)=x-3
3x+1=x-3
2x+1=3
2x=2
x=1
11 2/8 - 5 1/2 • 1 2/3 + 1 1/4
Answer:
[tex]3\frac{1}{3} = \frac{10}{3} = 3.333333333[/tex]
Step-by-step explanation:
Hope this helps.
Use grids to find the factors for the number 11
Answer:
only 1 is the factor as 11 is a prime number
WILL MARK BRAINLIEST ONLY HAVE 10 MINUTES AND DOUBLE POINTS
Hey there!
They are both correct, and their expressions are equivalent.'
9(S + T) + 45 = 9S + 9T + 45
Have a terrificly amazing day!
If 2a:3b=5:6 and 3b:2c=36:15,then find a:c
Answer:
a:c=2.5:1.25
Step-by-step explanation:
2a:3b=5:6
2(2.5):3(2)=5:6
3(2):2(1.25)=6:2.5=36:15
ANSWER PLEASE..................
What is (1 2/3) dived by (1/8)
Answer: 13 1/3
Step-by-step explanation:
caculate ( 5 + 0.036 + 0.4 ) - 0.08 = ?
ASAP I WILL GIVE BRAINLIEST
Answer:
5.356
Step-by-step explanation:
You add everything in parentheses then subtract that by 0.08.
A store pays 70.00$ for a bike the price mark up is 20% what is the mark up amount
Answer:
84$
Step-by-step explanation:
1. 20% of 70
0.20x70 = 14
2. Markup then add
70 + 14 = 84$
Please help meeeeeeeeeeeeeee
Find the simple interest on a P10500 loan at 20% for two years. (show
your process to get two points)
DO
D12
Dan
Answer:
P4200
Step-by-step explanation:
SI=PRT/100
P=Principal which is P10500
R=Rate which is 20%
T=Time which is 2 years
So SI= 10500×20×2/100
=P4200
Your teacher is giving a 150 point test. There are a total of 46 3-point questions and 5-point questions. How many of each are on the test
Answer:
Let x be the number of 3-point questions.
Let y be the number of 5 point questions.
How do you find the difference between an isosceles triangle and a normal triangle?
Answer:
In an equilateral triangle, all the sides and angles are of equal length. In an isosceles triangle, 2 of the sides are equal
Step-by-step explanation:
Solve in standard form: 2x +y=-2
Answer:
2x+y+2=0
Step-by-step explanation:
I from Mexico:)
good review if you answer with the right answer
Answer:
top left choice
Step-by-step explanation:
the slope is negative, so its flipped
the y int is -6, below the x axis
Answer:
Graph A (the top left)
Step-by-step explanation:
The correct graph has to have a negative slope. So this narrows the options down to either A (top left) or B (top right). The y-intercept has to be negative, and out of A and B, only Graph A meets this requirement.
Hope it helps!
Find two angles (in radians) whose sine ratio is...
Hi there!
[tex]\large\boxed{\frac{\pi}{3} \text{ and } \frac{2\pi}{3}}[/tex]
From the unit circle, we can locate the two values of sine Ф (y-value of the coordinate) at which sin Ф = √3/2.
The two values are Ф = π/3 and 2π/3.
What is the sum
X+
1
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x
100
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x+
ოjთ
3 5
O 5*+
3 7
X+
8
Answer:
use photo math lol
Step-by-step explanation:
when x is divided by 9, the remainder is 7. What is the remainder when x+4 is divided by 9
Answer:
First i always use khan academy
Step-by-step explanation:
Mai Finished her math assignment 3/5 hours. then she completed her English assignments in 1/3 hours. what was the total amount of time Mai spent doing these two assignments?
A sheet of standard U.S. typing paper measures 8.50 in by 11 in. What is its area in square centimeters? (Area =L x W)
Answer:
the area would be 935cm
Step-by-step explanation:
ty for reading :P
603.2246 square centimeters.
PLEASE HELP WILL GIVE BRAINLEST
SOLVE THE PROBLEMS WITH SUBSTITION
x=-3y+3
x-3y=-15
Answer:
y=3
Step-by-step explanation:
x=-3y+3
(-3y+3)-3y=-15
-6y=-18
y=3
A pew research Center project on the state of news media showed that the clearest pattern of news audience growth in 2012 came on digital platforms. According to pew research data, 39% of Americans get news online or from a mobile device in a typical day. a. Suppose that you take a sample of 100 Americans. If the population proportion of Americans who get news online or from a mobile device in a typical day is 0.39, what is the probability that fewer than 30% in your sample will get news online or from a mobile device in a typical day? b. Suppose that you take a sample of 400 Americans. If the population proportion of Americans who get news online or from a mobile device in a typical day is 0.39, what is the probability that fewer than 30% in your sample will get news online or from a mobile device in a typical day? c. Discuss the effect of sample size on the sampling distribution of the proportion in general and the effect on the probabilities in (a) and (b).
Answer:
Step-by-step explanation:
Given that:
the sample proportion p = 0.39
sample size = 100
Then np = 39
Using normal approximation
The sampling distribution from the sample proportion is approximately normal.
Thus, mean [tex]\mu _{\hat p} = p = 0.39[/tex]
The standard deviation;
[tex]\sigma = \sqrt{\dfrac{p(1-p)}{n} }[/tex]
[tex]\sigma = \sqrt{\dfrac{0.39(1-0.39)}{100} }[/tex]
[tex]\sigma = 0.048[/tex]
The test statistics can be computed as:
[tex]Z = \dfrac{{\hat _{p}} - \mu_{_ {\hat p}} }{\sigma_{\hat p}}[/tex]
[tex]Z = \dfrac{0.3 - 0.39 }{0.0488}[/tex]
[tex]Z = -1. 8 4[/tex]
From the z - tables;
[tex]P (\hat p \le 0.3 ) = P(z \le -1.84)[/tex]
[tex]\mathbf{P (\hat p \le 0.3 ) = 0.0329}[/tex]
(b)
Here;
the sample proportion = 0.39
the sample size n = 400
Since np = 400 * 0.39 = 156
Thus, using normal approximation.
From the sample proportion, the sampling distribution is approximate to the mean [tex]\mu_{\hat p} = p = 0.39[/tex]
the standard deviation [tex]\sigma_{\hat p} = \sqrt{\dfrac{p(1-p)}{n} }[/tex]
[tex]\sigma_{\hat p} = \sqrt{\dfrac{0.39 (1-0.39)}{400} }[/tex]
[tex]\sigma_{\hat p} =0.0244[/tex]
The test statistics can be computed as:
[tex]Z = \dfrac{{\hat _{p}} - \mu_{_ {\hat p}} }{\sigma_{\hat p}}[/tex]
[tex]Z = \dfrac{0.3 - 0.39 }{0.0244}[/tex]
[tex]Z = -3.69[/tex]
From the z - tables;
[tex]P (\hat p \le 0.3 ) = P(z \le -3.69)[/tex]
[tex]\mathbf{P (\hat p \le 0.3 ) = 0.0001}[/tex]
(c) The effect of the sample size on the sampling distribution is that:
As sample size builds up, the standard deviation of the sampling distribution decreases.
In addition to that, reduction in the standard deviation resulted in increases in the Z score, and the probability of having a sample proportion that is less than 30% also decreases.
A calculator is required to obtain the final answer on this question. A solid metal sphere at room temperature 20oC is dropped into a container of boiling water (100oC). If the temperature of the sphere increases 10o in 9 seconds, find the temperature of the ball after 18 seconds in the boiling water. (Assume the sphere obeys Newton's Law of Cooling.)
Answer:
38.71°C
Step-by-step explanation:
Given :
Initial temp, T0 = 20°C
Final temperature, T = 20 + 10 = 30°C
Time, t = 9 seconds
Surrounding temperature, Ts = 100°C
Newton's Law of cooling :
T = Ts + (T0 - Ts) * e^-kt
Obtain the value of k
30 = 100 + (20 - 100) * e^-9k
30 - 100 = - 80e^-9k
-70 = - 80e^-9k
-70 / - 80 = e^-9k
0.875 = e^-9k
Take the In of both sides
In(0.875) = - 9k
−0.133531 = - 9k
k = 0.133531 / 9
k = 0.0148
Hence,
t = 18
T = Ts + (T0 - Ts) * e^-kt
T = 100 + (20 - 100) * e^-0.0148(18)
T = 100 - 80 * e^-0.0148(18)
T = 100 - 80 * 0.7661326
T = 38.709392
T = 38.71°C