³√216400 + √280 + √322 = ________?
Correct answer: D. 95
- A. 651
- B. 361
- C. 100
- D. 95
Explanation
Approximate the radicals: cube root of 216400 is about 60.05, √280 is about 16.73, and √322 is about 17.94. Their sum is about 94.72, which rounds to 95, option d. The likely trap is 100, produced by rounding each radical too early or treating 216400 as an exact perfect cube.
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