15 3 2 4x 9 July 8, 2019 16 32 64 128 15 3 2 4x 9 answer 21 4x 9 8x 15 3 2 2x 3 9x 2 4x 15 15 2 4x 3 ) 2 9 2x 6x 2 15 1 3 4x 9 3 15 x 4 15 4/9-15 15 3/4 x 2
