Will give a diameter of a circle has endpoints p(-10, -2) and q(4, 6). a. find the center of the circle. b. find the radius. if your answer is not an integer, express it in radical form. c. write an equation for the circle. can someone explain how to do this?

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.