Question

Which of the following pairs of numbers combine to make 0?
A) 15 and -3.
B) -8 and -8.
C) 12 and -12.
D) -2 and 2.5.



A submarine is at -87 ft. It rises 87 ft. Where is it at now?

The submarine is now at ____ ft.

Answer 1

C) 12 and -12 (because 12 + (−12) = 0).

The submarine is now at 0 ft (−87 + 87 = 0), i.e., sea level.