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 7.6 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 880.8
B. 3.9
C. 2.9
D. 2.6
Answer: B
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Add or subtract. Then simplify. If a denominator has two or more factors (other than monomials), leave it in factored form. Express the answer using the denominator of the first fraction when applicable.
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A. 
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D. 
Provide an appropriate response.Solve the inequality: 3x + 2x ? 20
A. x ? 4 B. x ? 6 C. x < 4 D. x ? 4
Solve the problem.A power outage affected all homes and businesses within a 20 mi radius of the power station. If the power station is located 14 mi north of the center of town, find an equation of the circle consisting of the furthest points from the station affected by the power outage.
A. x2 + (y + 14)2 = 400 B. x2 + (y - 14)2 = 20 C. x2 + y2 = 400 D. x2 + (y - 14)2 = 400
Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.20 as soon as you get in the taxi, to which a charge of $2.15 per mile is added. Find an equation that can be used to determine the cost, C(x), of an x-mile taxi ride.
A. C(x) = 4.35x B. C(x) = 2.15 + 2.20x C. C(x) = 2.85x D. C(x) = 2.20 + 2.15x