Find the perimeter of a rectangle whose dimensions are 15 inches times 8 inches

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.

What is the product? a-3/15a × 5/a-3

Interpret the following expression (5y^2-7)^3/(2y)^2