Question

Which expression is not equal to $0$

• A. $5-5$
• B. $-7+7$
• C. $6-(-6)$
• D. $-8-(-8)$

Answer 1

The correct option is C

$6-(-6)$

Explanation for correct option:

In option C, we have

$\begin{array}{rcl}6-(-6)& =& 6+6\\ & =& 12\ne 0\end{array}$

So, option C is correct.

Explanation for incorrect options:

: $$\begin{gathered} A)5-5=0 \\ B)-7+7=0 \\ D)-8-(-8)=-8+8=0 \end{gathered}$$

In option A, B and D the value of the given expression is equal to $0$.

So, option A, B and D are incorrect option.

Hence, the only correct option is C.