Help me on this math problem please

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Find the quotient. 50a2 – 98b2 -5a +7b

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.