JAMB Mathematics 2025 Objective — Question 21
Question 21 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2025 Objective paper, with the correct answer and a full explanation.
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The rate of change of the volume of a sphere with respect to its radius when r=3 is:
- A. 12π
- B. 36πCorrect
- C. 9π
- D. 4π
Explanation
V=(4/3)πr³, dV/dr=4πr². At r=3, dV/dr=4π(9)=36π.
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