Kelsey has a 88% discount coupon for a wedding store she seasonal prom dress that she wants to buy after the 80% discount was applied because he paid $30 for a prom dress what was the original price of the prom dress

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.