Mathematical Modeling with Exponential and Logarithmic Functions-
An earthquake near New Zealand measured 4.2 on the Richter scale. Use the formula R = log (A/A0) to determine approximately how many times stronger the wave amplitude of the earthquake was than A0.

Answers-
A=15, 849↓0
A=0.62A↓0
A=66.7A↓0
A=66, 566A↓0