What is the difference r+2/r+4-3/r+1

Astudent simplified a rational expression as shown.

Which is the completely factored from of xy^3-x^3y

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?