Derek collects quarters that have the names of the 50 u. s. states on them. he has collected 13 different state quarters in 2.25 months. at this rate, how long will it take him to collect all 50?

Can some one me with this math problem?

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.

How do i put 3(x+7) in distributive property