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 6.7 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 826.1
B. 3.8
C. 2.5
D. 2.8
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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Find the distance between points P1 and P2.P1(-6, 3, 4) and P2(0, 6, 10)
A. 14 B. 10 C. 9 D. 18
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Solve the system by graphing on a calculator. Round to the nearest hundredth if necessary.y = 
x2 + y2 = 5.7
A. {(-1.84, 1.52), (1.50, 1.86)} B. {(-1.50, -1.86), (1.84, -1.52)} C. {(-1.84, -1.52), (1.50, -1.86)} D. {(-1.50, 1.86), (1.84, 1.52)}
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Determine whether the complex number is a solution of the equation.1 + 7i;y2 - 8y + 8 = 0
A. No B. Yes
Mathematics