Multiply (5x^2 x − 4)(x 2). 5x^3 x^2 − 4x − 8 5x^3 11x^2 − 2x − 8 5x^3 10x^2 − 4x − 8 5x^3 20x^2 2x − 8

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.