Find all solutions to the equation. Express the solution in degrees.
csc x + 2 = 0
A. 60° + 360°n or 240° + 360°n
B. 240° + 360°n or 300° + 360°n
C. 60° + 360°n or 120° + 360°n
D. 120° + 360°n or 300° + 360°n
Answer: B
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Rationalize the numerator of the expression.
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A. 
B. 
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D. ?
E. ?
According to the South Coast Air Quality Management District, the level of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in downtown Los Angeles is approximated by 
, 
, where A(t) is measured in pollutant standard index and t is
measured in hours, with 
corresponding to 7 a.m.
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Find 
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, 
.
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A. ?
B. ?
C. ?
D. 
E. ?
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