Answer
Since 79 is between 10 and 100, that is, between $10^{1}$ and $10^{2}$,
its common logarithm is between 1 and 2.
Work Step by Step
$\log x$ (written without a base) is the common logarithm, with base 10.
$\log 10=1$, because $10^{1}=10,$
$\log 100=2$, because $10^{2}=100,$ so
since 79 is between 10 and 100, that is, between $10^{1}$ and $10^{2}$,
its common logarithm is between 1 and 2.
