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Simplify both 9 - (-15) and 9 + 15, and compare the results.

ABoth expressions equal 6
BBoth expressions equal -24
C9 - (-15) differs from 9 + 15
DBoth expressions equal 24
Answer & Solution
Correct answer: D. Both expressions equal 24
1. Simplify the first expression using the subtraction property: 9 minus negative 15 becomes 9 plus 15. 2. 9 plus 15 equals 24. 3. Simplify the second expression directly: 9 plus 15 also equals 24. 4. Both expressions equal 24, confirming that subtracting a negative number is the same as adding its positive opposite. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.3 Add and Subtract Integers_
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