Write the expression as the sine, cosine, or tangent of an angle.cos 9x cos 6x - sin 9x sin 6x
A. sin 15x
B. cos 3x
C. sin 3x
D. cos 15x
Answer: D
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Graph the function defined by a radical expression.y = 4 
A. 
B. 
C. 
D. 
Solve the problem.To obtain a certain shade of paint, Peter mixed 
of white paint with 
of brown and 
of blue paint. How much paint did he have?
A. 
gal
B. 12
gal
C. 3
gal
D. 
gal
Solve the problem.100 employees of a company are asked how they get to work and whether they work full time or part time. The figure below shows the results. If one of the 100 employees is randomly selected, find the probability that the person does not work full time.
1. Public transportation: 7 full time, 6 part time2. Bicycle: 5 full time, 4 part time3. Drive alone: 35 full time, 28 part time4. Carpool: 6 full time, 9 part time
A. 0.43 B. 0.47 C. 0.53 D. 0.28
Describe the natural domain of the function. f(x) = 
A. The set of all real numbers
B. The set of all real numbers less than 8
C. The set of all real numbers greater than 
D. The set of all real numbers except 8