Me on questions 7 and so much for any !

Write the pair of fractions as a pair of fractions with a common denominator

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.