Val buys a computer for $720. If this is 120% of what the store paid for the same computer, how much did the store earn on the sale?

Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. y = x â’ 1 , y = 0, x = 5; about the x-axis v = sketch the region. sketch the solid, and a typical disk or washer.