Expand by using the distribution of property -c(3b-7a)

Find the value. a. 0.003 b. 0.03 c. 0.3 d. 3

Ineed with math stuff it involves graphs

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.