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 12 feet away when it has an intensity of 
W/m2.
A. ? 103 dB
B. ? 113 dB
C. ? 93 dB
D. ? 83 dB
Answer: A
Mathematics
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Find dy/dt.y = cos4(?t - 11)
A. 4 cos3(?t - 11) B. -4? sin3(?t - 11) C. -4 cos3(?t - 11) sin(?t - 11) D. -4? cos3(?t - 11) sin(?t - 11)
Mathematics
Translate the phrase to an algebraic expression. Use n for the variable unless otherwise stated.fourteen less than a number
A. n ÷ 14 B. 14 + n C. n - 14 D. 14 - n
Mathematics
Simplify the expression. Express the answer so that all exponents are positive. Whenever an exponent is 0 or negative, we assume that the base is not 0.(x-2y)6
A. x12y6
B. 
C. 
D. 
Mathematics
Select the graph of the polar equation using symmetry, zeros, maximum r-values, and any
other additional points.
?
?
A. Symmetric with respect to the polar axis
?
B. Symmetric with respect to the polar axis
?
C. Symmetric with respect to the polar axis
?
D. Symmetric with respect to the polar axis
?
E. Symmetric with respect to the polar axis
?
Mathematics