Question

The Richter scale uses logarithmic scales to measure earthquakes.
The Richter number, used to show the magnitude of an earthquake, is determined by the formula: (drawing), where R is the Richter number of the earthquake, I is the intensity of the earthquake, and Io is the intensity of the minimum detectable earthquake. If an earthquake is 121,000 times as the minimum detectable earthquake, what is the Richter number? (HINT: The intensity (I) of the earthquake would be 121,000 Io) Round your answer to the nearest tenth.