Which situation describes opposite quantities that when combined would equal zero

The situation that describes opposite quantities that when combined would equal zero is called "additive inverse."

Does this situation make a opposite that equals zero Sarah is charged a fee of $20 and withdrawals $20

No, the situation you described does not describe opposite quantities that would equal zero. In this situation, Sarah is charged a fee of $20 and withdrawals $20, which means she would have a net balance decrease of $40. The opposite quantities in this situation would be a fee of -$20 and a withdrawal of -$20, which would also result in a net balance decrease of -$40.

The situation that describes opposite quantities that when combined would equal zero is called "opposite or additive inverse." In this situation, when you have two quantities with opposite signs, or polarities, their sum will always be zero. For example, +5 and -5 are opposite quantities, and when you add them together, you get 0: +5 + (-5) = 0. Similarly, -3 and +3 are opposite quantities, and their sum is also 0: -3 + (+3) = 0.

The situation that describes opposite quantities that, when combined, would equal zero is known as "additive inverse." In mathematics, the additive inverse of a number is simply its negative counterpart.

To find the additive inverse of a number, you need to change its sign. For example, the additive inverse of 5 is -5 because 5 + (-5) equals zero. Similarly, the additive inverse of -3 is 3 because -3 + 3 also equals zero.

In summary, when you have two opposite quantities, if you add them together, they will cancel each other out and result in zero.