The cost of 3 apples and 7 tangerines is $2.10. Four apples and 3 tangerines cost $1.85. Set up the system of equations to find the cost of each apple and tangerine

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?