the additive inverse of 15 is multiplied by the sum of 12 and the additive inverse of 42
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additive inverse of 15=-15
additive inverse of 42=-42
therefore, -15×(12+-42)
-15×(12-42)
-15×-30
-×-=+
so 15×30=450
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450 is the answer
hope it helps
hope it helps
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