Renting a truck cost 55.00 per day and 0.38 per mile when the driver goes beyond the 40 free miles allotted how much would sam pay when renting the truck for 2 days and driving a total of 49 miles

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.