Question

lesson 27 - common and natural logarithms
score: 24/100 answered: 3/11
question 4
the base of the common logarithim, denoted log, is
10
π
e
2
the base of the natural logarithm, denoted ln, is
π
2
10
e

Explanation:

For the first question about the base of the common logarithm (denoted as $\log$), by definition, the common logarithm has a base of 10.
For the second question about the base of the natural logarithm (denoted as $\ln$), by definition, the natural logarithm has a base of the mathematical constant $e$ (Euler's number).

Answer:

First question: 10 (the option "10")
Second question: $e$ (the option "$e$")