3 Valley Video charges a $15 annual
fee plus $3 per movie for rentals.
Last year, Jennifer spent $99 at
the store. How many movies did
she rent?

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.