HELP!! The total cost for four people to bowl one game is $21. Each person paid $1.50 to rent their shoes, in addition to the cost of the game, c. Which of the following equations could be used to find the value of c?
4( c + 1.5) = 21
4( c + 6) = 21
4 c + 1.5 = 21
4 c - 6 = 21