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 5 m down from the top of the dome the ceiling is 4 m wide, find the best location for the light source.
A. 0.6 m down from the top
B. 0.8 m down from the top
C. 0.4 m down from the top
D. 0.2 m down from the top
Answer: D
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Determine the intervals on which the function is increasing, decreasing, and constant.
A. Increasing on (?, 0); Decreasing on (0, -?) B. Increasing on (-?, 0); Decreasing on (-?, 0) C. Increasing on (0, ?); Decreasing on (-?, 0) D. Increasing on (-?, 0); Decreasing on (0, ?)
Decide whether the pair of lines is parallel, perpendicular, or neither.The line through (3, -5) and (-1, 7) and the line through 
and 
A. Perpendicular B. Neither C. Parallel
Convert the angle to a decimal in degrees. Round the answer to two decimal places.21°17'34''
A. 21.34° B. 21.22° C. 21.29° D. 21.37°
Graph the function.y = 2 cos x - sin 4x
A. 
B. 
C. 
D. 