Problem: The value of 10log107 is:
Answer Choices:
A. 7
B. 1
C. 10
D. log107
E. log710
Solution:
In general, alogaN=N, with suitable restrictions on a and N;
or let 10log107=N. Taking logarithms of both sides of the equation to the base 10, we have log107⋅log1010=log10N.∴N=7.