Help help me help help plz help help me help

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Ineed someone to me answer my question i have to have this done and knocked out

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.