Question 7 A-B please show all work on a separate paper so I can fully understand

#7. The Richter scale is one way of converting seismographic readings into numbers that provide an easy reference for measuring the magnitude M of an earthquake. All earthquakes are ompare to a zero-level earthquake whose seismographic reading measures 0,001 millimeter as a distance of 100 kilometers from the epicenter. An earthquake whose seismographic reading measures x millimeters has magnitude M(x) given by M(x) = log where x0 = 10-3 is the reading of a zero-level earthquake the same distance from its epicenter. A. Determine the magnitude of the San Francisco earthquake in 1906; Seismographic reading of 50.119 millimeters 100 kilometers from the center. B. If the magnitude of an earthquake is 8.1 per 100 milometers from the center, what are the millimeters