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Bot GPT 4-o mini To simplify \(3\sqrt{21} + 7\sqrt{21}\), you can combine the like terms:
\[
3\sqrt{21} + 7\sqrt{21} = (3 + 7)\sqrt{21} = 10\sqrt{21}
\]
So the answer is:
\[
10\sqrt{21}
\]
Among the options provided, it corresponds to:
\[
10\sqrt{21}
\]
Therefore, the correct choice is:
**10√21**