Function f is shown on the graph

15 point ! ~ see if you know the answer to both you!

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.

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?