X(year)| y ($ in billions)
1980 | 120
1985 | 165
1990 | 239
1995 | 290
2000 | 376

the table shows the billions of dollars spent on food and drink in u. s. restaurants for the years shown. find the rate of change for 1980 to 1990.

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.