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 0.94 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to four decimal places.
A. -3.0269
B. 0.9731
C. 2.9731
D. -0.0269
Answer: C
Mathematics
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Solve.If y varies directly as x, and y = 3 when x = 8, find y when x = 40.
A. 15
B. 
C. 
D. 
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Convert the polar number 2.75(cos315° + isin315°) to rectangular form.
What will be an ideal response?
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Simplify the fraction.
A. 
B. 
C. 
D. 
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