The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (5t - 4t3)i + 4 tan (3t)j + e2tk
A. a
= 2?i + 144j + 4e(1/6)?k
B. a
= - 2?i - 144j + 4e(1/6)?k
C. a
= - 2?i - 144j + 4k
D. a
= - 2?i + 144j + 4e(1/6)?k
Answer: D
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The personnel manager of Gibraltar Insurance Company estimates that the number of insurance claims an experienced clerk can process in a day is 50. Furthermore, the rate at which a clerk can process insurance claims during the tth wk of training is proportional to the difference between the maximum number possible (50) and the number he or she can process in the tth wk. If the number of claims the average trainee can process after 1 wk on the job is 20/day, determine how many claims the average trainee can process after 7 wk on the job. ? Round the answer to the nearest integer. ? __________ claims
Fill in the blank(s) with the appropriate word(s).
Solve the problem.Wind speed varies in the first twenty meters above the ground. For a particular day, let 
compute the wind speed 
above the ground. What is the wind speed 
above the ground? Round your result to the nearest hundredth.
A. -1.95 m/sec B. 6.25 m/sec C. 5.79 m/sec D. 5.89 m/sec
Solve the problem.For what values of x would the rectangle have a perimeter of at least 152? 3x + 2 
A. 15 or less B. 7 or greater C. 15 or greater D. 7 or less
Graph the ellipse.4(x - 2)2 + 9(y + 1)2 = 36
A. 
B. 
C. 
D. 