Which situation describes opposite quantities that when combined would equal 0?

Question

A. Eileen moves seven spaces forward, then she moves two spaces back in a game.
B. Sarah is charged a fee of $20 and withdraws $20.
C. Eileen moves seven spaces forward, then she moves seven spaces back in a game.
D. Sarah deposits $20 in an account and then deposits another $20.

Answer 1

The situation that describes opposite quantities that when combined would equal 0 is:

C. Eileen moves seven spaces forward, then she moves seven spaces back in a game.

In this case, moving seven spaces forward (+7) and then moving seven spaces back (-7) are opposite actions. When combined, they equal zero (+7 + -7 = 0).