Rationalize the denominator and then simplify.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: A
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A school board has determined that there should be 4 teachers for every 50 students. How many teachers are needed for an enrollment of 2,750 students?
A. 245 teachers B. 209 teachers C. 220 teachers D. 204 teachers E. 163 teachers
Solve the problem.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 2 m down from the top of the dome the ceiling is 28 m wide, find the best location for the light source.
A. 98 m down from the top B. 73.5 m down from the top C. 49 m down from the top D. 24.5 m down from the top
Match the graph to one of the listed functions. 
A. f(x) = x2 + 8 B. f(x) = x2 + 8x C. f(x) = -x2 + 8 D. f(x) = -x2 + 8x
Solve the problem.If sin ? = 0.9, find sin (? + ?).
A. -0.1 B. -0.9 C. 0.1 D. 0.9