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. 2.7
B. 2.9
C. 886.5
D. 3.9
Answer: D
Mathematics
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Use the fundamental identities and appropriate algebraic operations to simplify the expression.
A. -sec x B. 1 C. sec x D. csc x
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Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = x2 from x = 0 to x = 4; n = 4
A. 27 B. 33 C. 30 D. 36
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Determine whether the statement is true or false.Every real number is either an integer or irrational.
A. True B. False
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