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B
[4,∞)
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C
[5,∞)
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D
(−∞,∞)
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Solution
The correct option is B[4,∞) 8−3x3≤2x3−4⇒8−3x≤2x−12⇒5x≥20⇒x≥4 Thus, all real numbers x which are greater than or equal to 4 are the solutions of the given inequality, i.e., x∈[4,∞).