The magnitude of an earthquake, r, can be measured by the equation mc030-1. Jpg,

The magnitude of an earthquake, r, can be measured by the equation mc030-1. Jpg, where a is the amplitude in micrometers, t is measured in seconds, and d accounts for the weakening of the earthquake due to the distance from the epicenter. If an earthquake occurred for 4 seconds and d = 2, which graph would model the correct amount on the richter scale?.