Find the length of the curve.x = 4 cos t, y = 4 sin t, 0 ? t ? ?
A. 4?
B. 16?
C. ?
D. 8?
Answer: A
Mathematics
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Evaluate the expression. All numbers are approximate. State your answer with the proper accuracy and precision.3.02(-60.5)2 - 2500/1.163 + 0.7285
A. 2.17 B. 13,397 C. 9424 D. 13,400
Mathematics
Multiply and simplify any radicals in your answer. Assume that all variables represent positive real numbers.(
+ 
)(
- 
)
A. a + 2
- b
B. a + b
C. a - b
D. a - 2
+ b
Mathematics
Use this graph to answer the question. 
What was the percent of increase in sales between month 2 and month 12 of 2007? Round your answer to the nearest tenth.
A. 28.6% B. 14.3% C. 22.2% D. 25.0%
Mathematics
Perform the indicated operation.
A. 21
B. -21
C. 
D. - 
Mathematics