Question 7 • Mathematics II
By the triangle inequality, the third side must be greater than the difference of the other two side lengths and less than their sum. Here, the difference is (2x + 2) − (x + 3) = x − 1, and the sum is (2x + 2) + (x + 3) = 3x + 5. Therefore, x − 1 < n < 3x + 5, which is choice A.
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