It's all on the picture ​

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.