Find the nth term an of the geometric sequence.3, 1, 
, 
, 
, . . .
A. an = (3)
n+1
B. an = (3)
n
C. an = (3)
n-1
D. an = (3)
n-1
Answer: D
Mathematics
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Solve.Locate the centroid of a semicircular region.
A. 
= 
= 
= 
a
B. 
= 
= 
= 
a
C. 
= 
= 
= 
a
D. 
= 
= 
= 
a
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Evaluate.(-16 + 86) ÷ 14 - 15
A. -20 B. -10 C. 10 D. 20
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Expand, where i2 = -1.
4
A. -1 B. 1 C. 1 - i D. 1 + i
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Add and simplify.
+ 
A. 
B. 
C. 
D. 
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