What is the rate of change of y with respect to x for this function? how do i solve problems like this?

If i am doing this correct.

pick to points and use the distance formula\
Y2 - Y1
divided by
X2 - X1

so i picked the points
-2, 12
0, 3

this would mean
12-3
0-(-2)
which would be 

9
2

so 9/2 it isn't possible so it would stay as 9/2 which is your answer.. C

Hope this helps.

The answer is $9.90 with rounding to the nearest tenth

Ithink is a. true, but not sure