Help me please..The question is from Normal distribution and probability theory

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

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.

If i have one apple and give you the apple, how many apples do i have?