Use the unit circle to determine the value of the given expression or state that it is undefined.cot (570°)
A. 
B. - 
C. 
D. - 
Answer: A
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Find the limit of the sequence or determine that the limit does not exist.an = 
4/n
A. ln 4 B. does not exist C. 0 D. 1
Find the specified quartile.The following scores were recorded on the midterm exam in Chemistry 102:93 81 59 69 82 74 61 77 95 84 88 7186 97 63 72 89 80 60 98 91 62 78 8376 81 94 66 83 96Find the lower quartile, QL.
A. 69 B. 71 C. 72 D. 70
Solve the problem.The polynomial 
approximates the shark population in a particular area, where x is the number of years from 1985. Use a graphing calculator to describe the shark population from the years 1985 to 2010.
A. The population remains stable. B. The population decreases. C. The population increases.
Factor the expression completely, if possible.x2 - 81
A. (x - 9)2 B. (x + 9)(x - 9) C. (x + 9)2 D. Does not factor