Savanna is playing a game with her friends. She tells them to each pick a number, and then she directs them to: 1. Multiply thei
r number by 4 2. Subtract 6 from that number 3. Divide that number by 2. Once they do that, they each tell Savanna their number a. Arturo says his "new" number is -15. What number did Arturo start with?
