1 3y 5 9y 7 2 July 8, 2019 16 32 64 128 1 2y 2 3y 5 9y 7 12 0.25 2 3y 1 3y 9y 5 7 9 3y-5 7y=16 2 1) 9 - 7y =2 5-3y