Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the dB level of a radio at average volume from 8 feet away when it has an intensity of 
W/m2.
A. ? 95 dB
B. ? 105 dB
C. ? 85 dB
D. ? 115 dB
Answer: B
Mathematics
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Find the real or imaginary solutions by using the quadratic formula.x2 - x = 30
A. {-5, 6} B. {1, 30} C. {5, 6} D. {-5, -6}
Mathematics
List the numbers from the set that are of the type indicated.{18, 
, -16, 0}Real numbers
A. 18
B. 18, 0
C. 18, -16, 0
D. 18, 
, -16, 0
Mathematics
Perform the indicated operation.3 gal 3 qt + 10 gal 3 qt
A. 14 gal 2 qt B. 15 gal 2 qt C. 14 gal 4 qt D. 13 gal 2 qt
Mathematics
Simplify.24 + 26 ? 28
A. 78 B. 1400 C. 652 D. 752
Mathematics