Simplify ASAP I will mark brainliest

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Taking algebra two apex courses and need with these questions

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.