What is the probability of flipping a coin and getting tails three times in a row

What expression is equivalent to 42x-56y

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.

Aphrase is shown read the phrase and give me the answer