The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log , where x0 = 10-3.What is the magnitude of an earthquake whose seismographic reading is 7.7 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.

A. 3.9
B. 2.7
C. 886.5
D. 2.9


Answer: A

Mathematics

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