Which expression correctly shows a he sum of opposite numbers

Answer 1

The expression that correctly shows the sum of opposite numbers can be represented as:

\[ x + (-x) = 0 \]

In this expression, \(x\) is any number, and \(-x\) is its opposite. The sum of a number and its opposite always equals zero. For example, if \(x = 5\), then the expression would be \(5 + (-5) = 0\).