Solve the problem.The number of ducks (in thousands) counted at a certain checkpoint in their migration is given by 
where t is time in months and t = 0 is October. Find the number of ducks passing the checkpoint between October and January.
A. 24,549
B. 17,618
C. 20,000
D. 24,536
Answer: A
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Find the standard deviation for the given data. Round your final answer to one more decimal place than that used for the observations.The manager of a small dry cleaner employs six people. As part of their personnel file, she asked each one to record to the nearest one-tenth of a mile the distance they travel one way from home to work. The six distances ( in miles) are listed below.14.2?14.9?26.8?46.9?11.5?17.7
A. 2904.0 mi B. 3787.0 mi C. 13.29 mi D. 36.9 mi
Solve the system by the elimination method.2x + 4y = 0-8x - 16y = -0
A. {(2, 3)} B. {(3, -5)} C. ? D. {(x, y)| 2x + 4y = 0}
Find the exact value of the expression if ? = 45°. Do not use a calculator.f(?) = cos ?Find 11 f(?).
A. 
B. - 
C. - 
D. 
Determine the domain and the range of the function.f(x) = -4x2 - 2x - 7
A. domain: all real numbers
range: 
B. domain: all real numbers
range: 
C. domain: all real numbers
range: 
D. domain: all real numbers
range: 