What is the cost of 1 pound of pears

Two lines parallel to the same plane are parallel to eachother

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.

Which is the graph of this function 3 square root of x plus one if