Find the nth term {an} of the geometric sequence. When given, r is the common ratio.4, - 2, 1, - 
, 
, ...
A. an = 4 ? 
n + 1
B. an = 4 ? 
n-1
C. an = 4 ? 
n-1
D. an = 4 ? 
n
Answer: C
Mathematics
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Solve the problem.Lisa stashed in an envelope on her dresser $454 each week for 9 weeks. Estimate the total amount she saved by rounding the weekly amount to the nearest hundred. Also find the exact amount she saved.
A. Estimate: $4,500; exact: $4,050 B. Estimate: $4,050; exact: $4,086 C. Estimate: $4,050; exact: $4,050 D. Estimate: $4,500; exact: $4,086
Mathematics
Find an equation for the graph.
A. y = 5 cos 
B. y = 3 cos (2x)
C. y = 2 cos (3x)
D. y = 3 cos 
Mathematics
Use a right triangle to simplify.tan (arccos x)
A. 
B. 
C. 
D. 
Mathematics
Evaluate the expression.28 - (-61)
A. 89 B. 33 C. -89 D. -33
Mathematics