Find the standard deviation.Lisa is currently taking an astronomy class. The instructor often gives quizzes. On the past seven quizzes, Lisa earned 47, 18, 36, 29, 15, 42, and 77. Find the standard deviation. Round your answer to one decimal place.
A. 36
B. 9,956.6
C. 12,588
D. 20.9
Answer: D
Mathematics
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A. ray;
B. ray; 
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A. 
, 
B. 
, 
C. 
, 
D. 
, 
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Find the center (h, k) and radius r of the circle with the given equation. 4(x - 3)2 + 4(y + 6)2 = 56
A. (h, k) = (3, -6); r = 
B. (h, k) = (-3, 6); r = 
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D. (h, k) = (-3, 6); r = 4
Mathematics