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Ne4ueva [31]
3 years ago
11

Can someone help with the questions in the picture with #22 and both parts of part 23

Mathematics
2 answers:
poizon [28]3 years ago
5 0
#22 is Ian. #23.a. is 77%. b. is Yes. c. is 16.
meriva3 years ago
5 0
22. It says the completion percentage is the number of completions divided by the number of passes. You will get a decimal first, then you change it into a percentage by either multiplying it by 100, or moving the decimal point two places to the right.
Tom: 10/22 = 0.45 = 45%
Ian: 9/18 = 0.5 = 50%
Ian has a higher completion percentage.

23. You get 17 out of 22 questions correct.
a) 17/22 = 0.77 = 77%
Your percent is 77.
b) You passed the test because you had 7% above the lowest score to pass.
c) To find the minimum number of correct answers needed to pass the test, replace the correct number of answers with "x" and make it equal to 0.70 because that's what you need to pass.
x/22 = 0.70
x = 15.4
Because you're dealing with a test, so only whole numbers are possible, you need to round that number up, since you can't go down or you will be below the minimum.
15.4 = 16
The minimum number of correct answers you need is 16 (out of 22).
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Any large random sample from a group of people will be representative of the entire group.
Grace [21]
False.

In a random sample each member of the group has the same chances to be choosen. A representative sample replicates the characteristcs that you want of the group. Many times you need to make the sampling not random to pick a sample that represents or replicates the group.
6 0
3 years ago
Write the equation for a line perpendicular to y=-3x+18 that goes through the point (-12,6)
Hatshy [7]

Answer:

y=\frac{1}{3} x -14

Step-by-step explanation:

The equation of the line you will find should be in the form y =mx+c , where m is the gradient and c is the y intercept.

The gradient of a line that is perpendicular to a line [of a known gradient] is the negative reciprocal of the gradient of the first. i.e. if a is the known gradient and the perpendicular gradient is b, ab = -1. Therefore the -3b=-1 and b= 1/3

you can now write y = mx +c as y = 1/3x +c

As you have been given a coordinate, you can input these values into y= 1/3x + c

-12 = 1/3(6) +c

-12 - 2 = c

c = -14

hence the equation of the line is y= 1/3x -14

5 0
3 years ago
A repair company’s charge for repairing a certain type of copy machine fits the model y = 47.38 + 0.617x where y is the number o
Tems11 [23]

Answer: 36.66min

Step-by-step explanation:

y = 47.38 + 0.617x

where y is the number of dollars

x is the number of minutes on the job

Given a value of y = $70, then

We substitute y = $70 in the equation.

70 = 47.38 + 0.617x

22.62 = 0.617x

X = 22.62/0.617 = 36.66min

6 0
3 years ago
I'm not sure how to simplify this expression with the exponents rules of multiplication
Vedmedyk [2.9K]
The rule of exponential multiplication is (a^x)*(a^y)=a^(x+y)
using this with your expression, we can do
(10^1)*(10^3)*(10^2)=10^(1+3+2)=10^6
Final answer:
10^6 or 1 million
Hope I helped :)
3 0
3 years ago
Two equations are given below: a – 3b = 9 a = b – 3 What is the solution to the set of equations in the form (a, b)?
Vilka [71]
A-3b=9
a=b-3

b-3-3b=9
-2b-3=9
-2b=12
2b=-12
b=-6

a=-6-3
a=-9

Solution: (-9,-6)
----
Check: 
-9=-6-3
-9=-9
TRUE


7 0
3 years ago
Read 2 more answers
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