Find the nth term of the geometric sequence.5, -10, 20, -40, 80
A. an = 5 ? (-2)n
B. an = 5 ? (-2)n-1
C. an = 5 ? (-2)n
D. an = a1 - 2n
Answer: B
Mathematics
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Perform the indicated operation. Simplify, if possible.
- 
A. 
B. 
C. 
D. 
Mathematics
Solve the right triangle; angle C is the right angle. Round to the nearest tenth where necessary.a = 3.8, A = 56.7°
A. b = 5.0, B = 33.3°, c = 4.5 B. b = 2.5, B = 33.3°, c = 4.5 C. b = 5.0, B = 33.3°, c = 6.3 D. b = 1.4, B = 33.3°, c = 4.0
Mathematics
Without graphing the function, determine its amplitude or period as requested.y = -3 cos 
xFind the period.
A. 
B. 
C. 4?
D. -3
Mathematics
Find the domain of the function of two variables.f(x, y) = 
A. {(x, y)| y ? -2x } B. {(x, y)| y ? -2x} C. {(x, y)| y ? 2x} D. {(x, y)| y ? 2x}
Mathematics