1. how much work is done on a 20-n rock that you lift 1.5 meters up?
a) 3 joules
b) 30 joules
c) 3 watts
d) 30 watts

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.