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 6.5 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 3.8
B. 2.4
C. 2.8
D. 812.9
Answer: A
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A city's main well was recently found to be contaminated with trichloroethylene (a cancer-causing chemical) as a result of an abandoned chemical dump leaching chemicals into the water. A proposal submitted to the city council indicated that the cost, measured in millions of dollars, of removing x% of the toxic pollutants is given by 
.
?
Find the vertical asymptote of C(x). Is it possible to remove 99% of the toxic pollutant from the water?
?
A. Vertical asymptote: 
It is possible to remove 99% of the toxic pollutant from the water
B. Vertical asymptote:
It is not possible to remove 99% of the toxic pollutant from the water
C. Vertical asymptote:
It is possible to remove 99% of the toxic pollutant from the water
D. Vertical asymptote:
It is not possible to remove 99% of the toxic pollutant from the water
Combine and simplify, if possible.-5
- 3y
A. (-5x2 - 5y2)
or -5
(x2 - y2)
B. (-45x2 - 45y2)
or -45
(x2 - y2)
C. (-15x2 - 15y2)
or -15
(x2 - y2)
D. (-15x2 - 15y2)
or -15
(x2 - y2)
Solve the equation by the method of your choice. Simplify irrational solutions, if possible.(x + 4)(x + 1) = 28
A. {-4, -1} B. {1, 4} C. {-3, 8} D. {-8, 3}
Simplify the expression. Write the result using positive exponents only.(x-5y5)-3
A. 
B. 
C. 
D. 