Answer:

Step-by-step explanation:
Given
Direct variation implies that:

Where k is the constant of variation.

Required
Find y when 

Make k the subject

For: 

For: 
becomes

Substitute 

Make y the subject




Hi!
So this is an algebra question. We basically want to know what number minus 2 and 1/2 is going to equal 7 and 1/2. An easy way to check for that first number is adding those two numbers together
So we take 2 and 1/2 + 7 and 1/2 , and because they have the same denominator we can add the two numbers . 2 + 7 = 9 and then 1/2 + 1/2 = 1 so 9+ 1 = 10
10- 2 1/2 = 7 1/2
Answer:
0.980
Step-by-step explanation:
Use a calculator with built-in distribution functions.
Example:
normcdf(-2.05, 10000) = 0.980