Well, 1/2*7=3.5. So you have to do each equation to see which ones are not equal to 3.5. A) 1*7=7/2=3.5 so A is not the right answer. B) 1/2*7=1/14=.07, so B is one of the correct answers. C) 1*7=7*2=14, so C is another one of the correct answers. D) 1*7/2=7/2=3.5, so D is not a correct answer. E) 14 is not equal to 3.5, so E is another correct answer. So the correct answers are B, C, and E.