Find the average rate of change of g(x)= -2x^3+2 from x= -1 to x=4. immediately because i'm struggling with this ! : (

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.