The radius of a cylinder is doubled and its height stays the same. By what factor does the volume change?
Answer and explanation
Correct answer: D. It is multiplied by 4
- Step 1: The volume is . Step 2. Doubling r multiplies by 4, so V is multiplied by 4. Answer: It is multiplied by 4. Why not the others: Factor 2 treats volume as linear in r, factor 8 would need all three dimensions doubled, and 6 has no basis.
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