Me ayudan y les doy corona​

For which pair of functions is (gof)(a)=|a|-2?

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?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15