The decibel, a measure of loudness, is related to the relative intensity of sound by the formula
Decibels 
(Relative intensity).
If relative intensity is multiplied by 1,000, how are decibels affected?
?
A. Decibels are increased by 3.
B. Decibels are decreased by 3.
C. Decibels are increased by 30.
D. Decibels are decreased by 30.
Answer: C
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Solve the problem.Find the points on the curve 
that are closest to the origin.
A. (729, ±
)
B. (729, 
)
C. (9, ±9
)
D. (9, 9
)
For the given functions f and g, find the requested composite function.f(x) = 
, g(x) = 
;
Find (f ? g)(x).
A. 
B. 
C. 
D. 
The total numbers of Navy personnel N (in thousands) and Marines personnel M (in thousands) from 2000 through 2007 can be approximated by the models
?
and 
?
where t represents the year, with t = 0 corresponding to 2000.
Find and interpret 
.
?
A. 
, which represents the difference between the number of Navy personnel and the number of Marines personnel.
B. 
, which represents the difference between the number of Navy personnel and the number of Marines personnel.
C. 
, which represents the difference between the number of Navy personnel and the number of Marines personnel.
D. 
, which represents the difference between the number of Navy personnel and the number of Marines personnel.
E. 
, which represents the difference between the number of Navy personnel and the number of Marines personnel.
Solve the problem.The quadratic function 
models the median, or average, age, y, at which U.S. men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1953, 36 years old B. 1960, 24 years old C. 1936, 49.7 years old D. 1960, 49.7 years old