Question 1040780
.
log 20 + log 5
~~~~~~~~~~~~~~~~~


= log(100) = 2*log(10) = 2 (if the base of logarithm is 10).


On logarithms read the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/what-is-the-logarithm.lesson>WHAT IS the logarithm</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/Properties-of-the-logarithm.lesson>Properties of the logarithm</A> 

in this site.