The baby weighed 7.25 pounds at birth. at the end of 8 months the baby weighed 2 1/2 times its birth weight .how much does the baby weigh at 8 months

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.