(picture included) could someone give me the answers to #6?

Which expression gives the exact value of x?

Pleas ! its urgent! what is the value of x? enter your answer in the box. mm

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.