Question

An earthquake near New Zealand measured 4.2 on the Richter scale. I will send a picture of the rest of the question because it won't make sense if a type it here.

Answer 1

They give you the following formula:

R = log(A/Ao)

Where:

R = 4.2

log = Natural log

We need to solve for A, so:

Take the exponential function to both sides:

e^(4.2) = e^log(A/Ao)

66.68 = A/Ao

Multiply both sides by Ao

A = 66.7Ao