math/ACT/algebra

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If one side of a triangle is 10 inches long, which of the following could NOT be the lengths, in inches, of the other sides?
A. 2 & 9
B. 3 & 5
C. 5& 10
D. 10 & 10
E. 10 & 12

I think it might be B but I don't know and I don't know how to figure the answer.. please help!

  • math/ACT/algebra -

    This is a second post of the same question. I answered it already.

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