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.Find the magnitude (to one decimal place) of an earthquake whose seismographic reading is 2000 millimeters at a distance of 100 kilometers from its epicenter. Round the answer to the nearest tenth.
A. 6.4
B. 6.3
C. 5.9
D. 7.3
Answer: B
Mathematics
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