List all the elements of B that belong to the specified set.B = 
Rational numbers
A. 20, -8, 0, 
, 
, 0.21
B. 20, -8, 0, 
C. 20, 0, 
D. 
, 
Answer: A
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A. converges conditionally B. converges absolutely C. diverges
Write the power of i as i, -1, -i, or 1.i3
A. -i B. 1 C. -1 D. i
Solve the inequality.
< 0
A. (-7, -5) or (2, 9) B. (-?, -5) or (-7, 9) C. (-7, -5) or (2, ?) D. (-5, 2) or (9, ?)
Solve the problem.Two recording devices are set 2,800 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 400 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
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