What number must be added to $- 21$ to obtain $0$ ?
A) $1$
B) $- 21$
C) 42
D) $0$
E) $21$

Name: What number must be added to $- 21$ to obtain $0$ ? A) $1$ B) $- 21$ C) 42 D) $0$ E) $21$
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Question

What number must be added to $- 21$ to obtain $0$ ?
A) $1$ 
B) $- 21$ 
C) 42 
D) $0$ 
E) $21$

Quizplus · Accepted Answer

To find out what number must be added to $- 21$ to obtain $0$, we need to find the additive inverse of $-21$, which is $21$. Therefore, we need to add $21$ to $-21$ to obtain $0$. Hence, the answer is choice E.

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