Question

A backpacker started his day at an elevation of x feet above sea level. After a day of hiking, the backpacker was at sea level.Which equation models this situation? (asap, thanks.)
A. x + 0 = 0

B. x + x = 0

C. 0 - x = x

D. x + (-x) = 0

Answer 1

My guess is that your answer D :)

Answer 2

D. x + (-x) = 0

That is the answer because if you are x feet above sea level, to get back to sea level, which equals zero (0), you need to go down the same amount you went up (x), so you need to go down x feet (-x).