Last year a business had profits of 8,000 this year it profit are five time as great what are this year profits

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.

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

Can someone answer this question for me