Answer:
1. The exponential function to model earthquake intensity as a function of a Richer Scale number is f(x)=10^x (to the power of x)
2. To compare the intensity of the 1811 New Madrid earthquake and the 1906 San Francisco earthquake, the function can be used to find the ratio of f(x) for x=8.1 to f(x) for x=7.8
3. The 1811 New Madrid earthquake was about two times the intensity of the 1906 San Francisco earthquake.
Explanation: