Does anyone know the answer?

Can someone me with the property questions for 12 13 and 14 plz

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.

Which is the focus of a parabola with equation y2=4x