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

Quizplus · Accepted Answer

To find the number that must be added to $-21$ to obtain $0$, we want to solve the equation $-21 + x = 0.$ Adding $21$ to both sides gives us $x=21,$ so the answer is $\boxed{\text{(E) }21}.$

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What Number Must Be Added To $- 21$ To Obtain $0$ ?
A)