Solve the problem.Find an equation of the line containing the centers of the two circles x2 + y2 + 10x + 8y + 40 = 0
and x2 + y2 + 4x - 2y + 1 = 0
A. -5x + 3y - 13 = 0
B. 5x + 3y - 13 = 0
C. -3x + 7y - 13 = 0
D. -5x - 3y - 13 = 0
Answer: A
Mathematics
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? is a central angle that cuts off an arc of length s. Find the radius of the circle if ? = 3°, 
m .
?
If the answer needs rounding, round it to three significant digits.
?
r = __________ m
Fill in the blank(s) with the appropriate word(s).
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.
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B. 1.778
C. 4
D. -1.778
Mathematics