If the midpoint of ST is (5, -8),what is S if T is (1, 12)?

Can someone check my answer? you : )

Which of the following is true for the relation f(x)=2x^2+1

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.