N 4 7 =- 2 July 8, 2019 16 32 64 128 N − 4 )( 2n 7 ) 7 n 4 )= 21 14 7 n 4 2 he 14 7 n 4 2 he 1 1 h 14 7 n 4 2 he x 1 1 h 4 n 7 )= 2n 8 N 4 7 7 2n 3 7 n 4 7 20 1 2 n 4 )- 7 =- 2n 6 M 4 n 7 2 Simplify n 4 )( 2n 7 N 4 7 7 2n 2 9 4 n 7 29 e 4 n 9 2 7 7 n 4 )= 21 answer