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Select the inequality that can be used to determine the unknown number. A. x2 + 3x ≥ 15 + x B. x2 - 3x - 21 > 15x C. x2 - 3x + 7 ≥ 15x D. x2 - 3x + 21 > 15 + x

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A, i’m not sure how to explain it by words i just know how to do the work
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