Pls help I really need a good grade on this

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.

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply