What is the perimeter of a 4' square

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.

Need plz been trying to do it for a long time and still haven’t succeeded

What is the solution for 6 - 7/8? explain the steps.