The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log 
, where xo = 10-3.What is the magnitude of an earthquake whose seismographic reading is 7.4 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 3.9
B. 869.2
C. 2.6
D. 2.9
Answer: A
Mathematics
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