Question

Which one is it and how? Please help

Answer 1

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`10^(13)`

Explanation:

Numbers with the same base multiplying with each other will have their expoenent add up.

In this case, both number has a base of -10, so we're allow to group them and add up their exponents.

`(-10)^8(-10)^5=(-10)^(8+5)=(-10)^(13)`