Question

True or False If a logarithm is written without a base it is a natural logarithm.

Answer 1

The answer is: False. 

 If a logarithm is written without a base it IS NOT a natural logarithm.
 
The explanation is shown below:

 1. If a logarithm is written without a base, you must assume the base is 10. It is written as below:

 log(x)

 2. It is important to know that the base a natural logarithm is the irrational number e. It is written as below:

 ln(x)