## Algebra and Trigonometry 10th Edition

In a logarithmic function with base $10$, as $x$ becomes $10$ times greater, $y$ increases by $1$ unit. $y=\log10x=\log10+\log x=1+\log x$ Also: $y=\log100x=\log100+\log x=\log10^2+\log x=2+\log x$