JAMB Mathematics 2021 Objective — Question 36

Question 36 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

36. If log10 2.0 = 0.3010, log10 3 = 0.4771 and log10 7 = 0.8451, evaluate log10 4.2 (a) 1.6232 (b) 0.6232 (c) 0.4331 (d) 1.4331

A. 1.6232
B. 0.6232Correct
C. 0.4331
D. 1.4331

Explanation

4.2 = (7×2×3)/10, so log10 4.2 = log10 7 + log10 2 + log10 3 - log10 10 = 0.8451+0.3010+0.4771-1 = 0.6232.

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