Solve the problem. If the base of the log is not specified, assume that it is 10.The loudness of a sound can be approximated by the formula d = 10 log 
, where d is the number of decibels. The higher the value of d, the louder the sound. Find the number of decibels when 
and 
A. 14 decibels
B. 10,000 decibels
C. 40 decibels
D. 4 decibels
Answer: C
Mathematics
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Solve the problem.An airplane flying faster than the speed of sound creates sound waves that form a cone. If ? is the vertex angle of the cone and m is the Mach number for the speed of the plane, then 
Find the Mach number to the nearest tenth if 
A. 1.7 B. 2.4 C. 1.0 D. 1.4
Mathematics
Convert. When necessary, round the answer to two decimal places.3
gallons = ____ pints
A. 28 B. 7 C. 56 D. 14
Mathematics
Find the focus and directrix of the parabola.y2 = -28x
A. F: (-7, 0); D: y = 7 B. F: (7, 0); D: x = -7 C. F: (-7, 0); D: x = 7 D. F: (0, -7); D: y = 7
Mathematics
Give the equation of the vertical asymptote(s) of the rational function.g(x) = 
A. x = 1 B. x = 1, x = -6 C. x = -1, x = 6 D. x = -1
Mathematics