This is due in 30 minutes I need help

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

What is the 12th term of b(n)=-4-2(n-1)

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?