Find the nth term {an} of the geometric sequence. When given, r is the common ratio.2, 1, 
, 
, ...
A. an = 2 
n-1
B. an = 2 
n-1
C. an = 2 ? 2n-1
D. an = 
(2)n-1
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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A. 0.002094 mg B. 2,094 mg C. 20,940 mg D. 0.02094 mg
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Determine whether the lines through each pair of points are parallel, perpendicular, or neither.(-2, 9) and (-8, 25); (8, 7) and (5, 15)
A. neither B. parallel C. perpendicular
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Solve for the given letter.-5k + ar = r - 6y for r
A. r = 
B. r = 
C. r = 
D. r = 
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