Guys pls help in 1 min because this is a test so i HAVE to get is right
AND EXPLAIN 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 slope of the line shown below?

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2