7th grade math help me pleaseee :)

A.  A + B (it'll be negative because they're both negative numbers and adding a negative is the same as subtracting a positive)

B. B - A ( It'll be positive because subtracting a negative is the same as adding a positive, and B is closer to 0 so it's a "bigger" number than A. so, adding A to B will make it positive)

Step-by-step explanation:

The explanations are in parenthesis to the right of the answer. they're kind of confusing, but the answers are correct.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.