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The longest side in the triangle is opposite to the largest angle of this triangle. If triangle is acute, then all angles are acute. Acute angle has cosine that is positive.
Use cosine theorem to determine the cosine of the largest angle:
where
is the largest angle.
Then
Since then
Divide this inequality by 5:
Note that then the smallest possible whole-number value of x is 7.
Answer: correct choice is B