Write the sum without sigma notation and evaluate it.
A. 2 cos ? + 2 cos 
+ 2 cos 
+ 2 cos 
= 3 + 
B. 2 cos ? + 2 cos 
+ 2 cos 
+ 2 cos 
= -1 + 
C. 2 cos ? + 2 cos 
+ 2 cos 
+ 2 cos 
= -2 + 
+ 
D. 2 cos ? + 2 cos 
= -2 + 
Answer: B
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Let A = set of teams that won at least 31 medals.Let B = set of teams that won at least 7 gold medals.Let C = set of teams that won at least 5 silver medals.
A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
Find a polar equation for the curve represented by the given Cartesian equation. Select the correct answer.
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Evaluate the square root.-
A. -23
B. 
C. 23
D. -24