Answer:
The answer is B. x-7
Step-by-step explanation:
The others are mathematically correct. The reason B. is incorrect is because you cannot swap the (x) in a subtraction problem, like in addition or multiplication. It would make the answer completely incorrect, unlike the others.
The reason the others are correct is because a negative plus a positive (C.) would make it a positive, like A.. For example if you are on a number line, you would start at point C.. on the negative side. If you were to go to the right 7 times, because we are adding. It would give us the same answer as A..
D. is the same problem as C., just in a different form. We would do this problem the same way as we did C.. If we do it the same way, of course it would be the same as A. also.
Because we know this, it make B. the odd ones out, making it the correct answer. Hope this helped!
