Use mental math to evaluate the expression 6(31)+6(4)-6(15)
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2015-11-05 23:02:14
remember distributive property a(b+c)=ab+ac we can ervers it 6(31)+6(4)-6(15)=6(31)+6(4)+6(-15)=6(31+4-15)=6(20)=120
2015-11-05 23:03:29
Okay this is how i did it, 6(31) + 6(4) - 6(15) 186 + 24 - 90 = 120
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