X+fx =45 is equal to what

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?

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.