Agroup of 72 people travel to the beach for a clean-up day. some of the people bring their own supplies (such as gloves, water, and garbage bags). supplies are provided for the rest of the people. write an equation for the number of people for whom supplies will be provided, p, if b people bring their own supplies.

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.