Please help me i don’t get this

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

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.

Find the area of a parallelogram with base 15 yards and height 21 2/3