The difference of the product of 3 and 6 minus the quotient of 6 divided by 2

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Which function has the domain x> -11

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take