Who can solve this you just have to calculate the measure of each lettered angle

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.

Just tell me how to set up the equation.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base