For every value tht x increases, y decreases by 3
-3x
Then to find the y intercept, look at 0's corresponding value (8)
-3x+8
We assume that the function is as follows:

Then, we have that:

Thus, if we have that:

Therefore, the value for the function is f^-1(2) = -1/2 or
The answer for number 4 is 13 and number 6 is 121 and the last problem for number 7 is 112
Answer:
the standard deviations 12.2 if I'm correct.