Pleases help quick please

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.

What is the value of the expression below? 148+(-6)| + |– 35= 7|

What is the ratio of the length of an object in yards to the length of the same object in miles?