The intensity of an Earthquake is a logarithmic quantity that follows the equation:
R = log(I/Io)
where I is the intensity of the quake and Io is the intensity of a "threshold" quake that is barely felt.

1. Micro quakes tend to be below 2.0 on the Richter scale and moderate quakes are around 4.0. How would you classify a quake that has an intensity of 9897Io? Show your work.

*note the 9897Io is supposed to be an I and a small zero, also the equation R=log(I/Io), are I over I with a small zero in the corner*

2.On the news you might hear about an event that was 7.5" on the Richter scale. How intense is this quake? Show your work.