JAMB Mathematics 2019 Objective — Question 16

Question 16 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

Given that log₁₀ 2 = 0.3010 and log₁₀ 7 = 0.8451, evaluate log₁₀ 280

A. 0.4471
B. 2.4471Correct
C. 1.4471
D. 3.4471

Explanation

280 = 2×2×7×10. log₁₀280 = 2log₁₀2 + log₁₀7 + log₁₀ 10 = 2(0.3010)+0.8451+1 = 2.4471.

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