Use the Change-of-Base Formula and a calculator to evaluate the logarithm. Round your answer to two decimal places.
-$\log _ { 3.9 } 10$
A) $1.69$
B) $1.00$
C) $2.56$
D) $0.59$

Question

Quizplus · Accepted Answer

The Change-of-Base Formula allows us to rewrite the logarithm in a form that can be calculated using a standard scientific calculator: $\log _ { 3.9 } 10 = \frac{\log _ { 10 } 10}{\log _ { 10 } 3.9}$. Using a calculator to evaluate this expression gives approximately 1.69.

Use the Change-Of-Base Formula and a Calculator to Evaluate the Logarithm