Calculate the area of the regular pentagon below.

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.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points