Answer :
Final answer:
The expression 2√7 + 8√7 simplifies to 10√7.
Explanation:
To simplify the expression 2√7 + 8√7, we can combine the like terms. Both terms have √7 as a common factor. So, we can rewrite the expression as (2 + 8)√7. Simplifying further, this becomes 10√7. Therefore, the correct choice is C. 10√7.
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