$9,400 at 5.6% for 9 months​

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.

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Pls brainliest will be awarded if answer is correct