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You already know the square root of 144. At least I hope you do.

12, but that doesn't help me. /:

Yes, it does, because now you have reduced it to:
12 - sqrt(40) - sqrt(10)

Yes, but that results in 8.8377223398.

Oh wait! Nevermind, thank you.

?

That's now how you're supposed to express the solution.

I* was wrong. The other choice was 12 - sqrt(10).

Are you sure one of the answer choices wasn't 12 - 3sqrt(10)?