madisonmariesmi madisonmariesmi

15-02-2018
Mathematics

contestada

I don't understand. What did he do wrong?

I dont understand What did he do wrong class=

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carlafossil320 carlafossil320

15-02-2018

Fernando incorrectly found the product of -2 and -5. When you multiply two negative numbers, the product will be a positive, so -2×-5=10.
Therefore, the last lines of working out should look like this:
10+10+9
29

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