Logarithms Practice Test 2

Question : 4 of 39

Marks: +1, -0

\log_10 2 = 0.3010

and

\log_10 7 = 0.8451

, then find the value of

\log_10 2.8

Solution:

\log_10 2.8=\log_10 ({7×2^2}/10)

=\log_10 7+2\log_10 2-\log_10 10

=0.8451+2×0.3010-1

=1.4471-1=0.4471

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