P=7r+3q
r= 5 and q= -4

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.

Is the figure congruent? yes or no?

Which statement about the annual percentage rate (apr) is not true?