Answer:
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When multiplying numbers a negative number will make a positive into a negative. Yet if multiplied again by another negative it will cancel out or make it positive again. Seeing as answer c has only one negative it's the correct answer.
The property used is: Multiplicative identity
Step-by-step explanation:
We need to identify the property in the equation : 
The property used is: Multiplicative identity
Multiplicative identity
The multiplicative identity property is defined as if you multiply a number by 1, the result of multiplication is that original number.
In the given expression
-3 is multiplied by 1 to get -3 so, multiplicative identity.
Keywords: Properties of Multiplication
Learn more about Properties of Multiplication at:
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240x3= 720
720+80 = 800
800/20= 40
The answer is 40.
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