A BOX OF PEN COST SELLS FOR $20 . THIS WEEK IT IS ON SALE FOR 30% OFF THE ORIGINAL PRICE . WHAT IS THE SALE PRICE OF THE SET?

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.

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)