Which function is a quadratic function? u(x) = –x + 3x2 – 8v(x) = 2x2 + 8x3 + 9xy(x) = x2 + 3x5 + 4z(x) = 7x2 + 2x3 – 3

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.