Solve the problem.The ceiling height of a room is 8 feet. The width of the floor is 7 feet and the length is 6 feet. How much airspace is in the room?
A. 48 ft3
B. 42 ft3
C. 56 ft3
D. 336 ft3
Answer: D
Mathematics
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Find the value of df-1/dx at x = f(a).f(x) = 3x2, x ? 0, a = 5
A. 
B. 30
C. 
D. 
Mathematics
Solve the problem. Round your answer, if appropriate.A stained-glass window in a church is designed to be the area between y = - x4 + 256 and y = 0 (dimensions in feet). What is the area of the window?
A. 2048 ft2
B. 
ft2
C. 
ft2
D. 
ft2
Mathematics
Solve.In the study of alternating electric current, capacitive voltage is given by 
, where f is the number of cycles per second, i is the maximum current, and t is the time in seconds. Solve the equation for t.
A. t = 2?f cos 
B. t = 
arccos 
C. t = 2?f arccos 
D. t = 
arccos 
Mathematics
Simplify the expression. Assume that all variables are positive when they appear.
A. 8y4 
B. 8x3y4 
C. 8x7y8 
D. 8x3y4 
Mathematics