Hello there,

To start it off, 2 x 39= 78
So a is correct that would be 2 x 30+9 = 2x39= 78
So b is correct as well. 2 x 40-1= 2 x 39= 78
c is questionable 2 x 30 +9= 60 + 9 = 69
So d is correct 18 + 60 = 78
So e is correct 100-22 = 78

So 2 x 39 is not equal to (2 x 30) +9

Hope this helped!

5 0

3 years ago

Please help with these questions

AveGali [126]

5 ft.................

8 0

3 years ago

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What’s e simplified form of 2x+3-x+5

TEA [102]

To simplify 2x+3-x+5, we can first group x together,then calculate:

$2x + 3 - x + 5 \\ = 2x - x + 3 - 5 \\ = x - 2$
Therefore the answer is x-2.

Hope it helps!

3 0

4 years ago

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