Simplify the expression.cos4x + sin2x cos2x
A. cos2x
B. sin2x + 1
C. -sin2x
D. cos2x + 1
Answer: A
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Find the limit.
sec x
A. -? B. 0 C. ? D. 1
Determine the domain and range of the relation.{(-1, 9), (5, 5), (-7, -9), (-7, -6)}
A. Domain: {-1, -7, 5, 7}; Range: {9, -9, 5, -6} B. Domain: {-1, -7, 5, -7};Range: {9, -9, 5, -6} C. Domain: {-1, -7, 5}; Range: {9, -9, 5, -6} D. Domain: {9, -9, 5, -6}; Range: {-1, -7, 5}
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 10 feet away when it has an intensity of 
W/m2.
A. ? 45 dB B. ? 75 dB C. ? 55 dB D. ? 65 dB
Solve.How much commission will an agent make on the sale of a $769,000 house if she receives 
of the selling price?
A. $5492.86 B. $10,766.00 C. $1076.60 D. $54,928.57