im tired of ppl giving me wrong answers. Please will somebody help! ill give brailiest as long as i get full answers and explanations for questions 1, 2, and 3 that are shown in photo.

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.