10x 4 7x 9 July 8, 2019 16 32 64 128 10x 3 6x 4 15 7x 9x 3 7x 4 9x 6 10x 6x 8 10 x 10 40 7 x 10 10x + 4 = 7 10 x 10 x 7x4 9