What is the cube root of 2,097,152?

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A 258
B 118
C 178
D 128

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Answer: D. 128

2,097,152 = 2^21, so its cube root is 2^7 = 128. Check: 128 x 128 = 16384, and 16384 x 128 = 2,097,152. A cube ending in 2 must have a cube root ending in 8.

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What is the cube root of 2,097,152?

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