How many multiples of three are between 10 and 787 and show work pls

Can (2,3 and square root 10) be sides ona right triangle?

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.

Answer! if you don’t mind, can you explain