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If \(n\) is an integer such that \(\frac{|n+6|-|n-3|}{\sqrt{100-n^3}} \geq 0\), then the number of possible values of \(n\) is __________

Question and options

If nn is an integer such that ∣n+6∣−∣n−3∣100−n3≥0\frac{|n+6|-|n-3|}{\sqrt{100-n^3}} \geq 0, then the number of possible values of nn is __________
  1. 11
  2. 7
  3. 5
  4. 6

Answer and explanation

Correct answer: D - 6

There are 66 possible integers. The denominator must be positive, so n3<100n^3 < 100 gives n≤4n\le4 over the integers. The numerator is nonnegative when ∣n+6∣≥∣n−3∣|n+6|\ge|n-3|, which after squaring gives 18n+27≥018n+27\ge0 and hence n≥−1n\ge-1 over the integers. There are six integers from −1-1 through 44, and rounding the lower bound down to −2-2 would incorrectly give seven.

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