5x+10=20 what is the answer to this question

With alll of except for the 2 that i did already

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

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.