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One possible expression that Jin could use to describe the number of wolves in Year 4 is (x+3)(x-5).
Multiplying the two terms together, we get:
(x+3)(x-5)
= x^2 - 5x + 3x - 15
= x^2 - 2x - 15
Therefore, the expression Jin uses to describe the number of wolves in Year 4 is x^2 - 2x - 15.