A ) is not correct because x/x = 1 so you get 10 and not 10x B) is not correct because 10*10x - 1 = 100x - 1 which is not 10x C) simillar as B. Not correct D) is correct. 50x/5 is same as 50/5*x = 10x E) correct. Straight forward. 50/5 = 10 and when multiplied by x gets 10x F) x5 or 5x however it is meant to be written is not 10x
