3 7 x 1 2 9 8 July 8, 2019 16 32 64 128 8x 7 2 4x 3 )( x 1 )= 9 2 1 2 3 4 x 6 7 8 9 X 2 7 x 1 8 x 9 3 0 3 x 3 = 9 1) 7(a + 2) 2) 9(3 - x)