Who goes to rsm (russian school of math)

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 factored form of the following expressions? d^2 – 13d + 36

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x