Eric had 4/7 of spool of yarn. He used 3/7 of his yarn for a project. What fraction of the spool was used for the project? Write your answer in simplest form.

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.