Set up a proportion and use it to solve for x.
X
64
48

Pls will give brainliest and all p.s u can zoom in if u cant see plss

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.

Icould really use some with this question.