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2 years ago

Consider the equation 2/5y = 20. Tell whether each statement is true or false

Mathematics

1 answer:

svlad2 [7]2 years ago

3 0

Answer:

A. True
B. False
C. False
D. True

Step-by-step explanation:

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john started homework at 7:00 pm he finish at 3:00 then he checked double the amount last time how much time did he spend

Scilla [17]

K, so am assuming of th next day

from 7pm to 12 midnight is 5 hours
from 12 midnight so 3am is 3 hours
3+5=8

8 hours total

checked double the amoutn last time
he spent 16 hours last time?

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2 years ago

There are 18 girl in a class and boys in the class is 3:2. Find the number of boys.

Sunny_sXe [5.5K]

Answer

Explanation

2xand 3x

let 3 be 3x

3x=18

X=18/3

X=6

now

2x=2multiply6

the number of boys is 12

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2 years ago

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Alla [95]

Answer:

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Step-by-step explanation:

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2 years ago

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¿Cuál es el resultado de (-2)(-3)*(-1)x 5?<br>

podryga [215]

=-30
-2*-3=6
-1*5=-5
6 x -5=-30

8 0

2 years ago

A college job placement office collected data about students’ GPAs and the salaries they earned in their first jobs after gradua

frez [133]

Answer:

X is the GPA

Y is the Salary

Standard deviation of X is 0.4

Standard deviation of Y is 8500

E(X)=2.9

E(Y)=47200

We are given that The correlation between the two variables was r = 0.72

a) $y = a+bx$

$b = \frac{\sum(x_i-\bar{x})(y_i-\bar{y})}{\sum(x_i-\bar{x})^2} = \frac{r \times \sqrt{var(X) \times Var(Y)}}{Var(X)} = \frac{0.72 \times \sqrt{0.4^2 \times 8500^2}}{0.4^2} = 15300$

$a=y-bx = 47200-(15300 \times 29) = 2830$

So, slope = 15300

Intercept = 2830

So, equation : $y = 2830+15300x$

b) Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1880. What salary is he earning?

$y = 2830+15300 \times 3.3 = 53320$

Observed salary = Residual + predicted = -1860+53320 = 51440

c)) What proportion of the variation in salaries is explained by variation in GPA?

The proportion of the variation in salaries is explained by variation in GPA = $r^2 = (0.72)^2 =0.5184$

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2 years ago