The graph of 
is given in the figure. State whether 
or 
A. a < 0
B. a > 0
Answer: B
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 4 for r(t) = (8t2 + 2t + 9)i - 2t3j + (2 - t2)k
A. v(4) = 62i - 96j - 8k B. v(4) = 66i - 96j - 8k C. v(4) = 34i - 32j - 4k D. v(4) = 66i + 96j + 8k
The scores on a 30-point multiple-choice exam are given in the following frequency table:
What is the the mean score on the exam?
A. 25 B. 25.5 C. 26 D. 26.5
Find the value of s in the interval [0, ?/2] that makes the statement true. Round to four decimal places.csc s = 2.6819
A. 0.1821 B. 0.4821 C. 0.2821 D. 0.3821
Solve the problem.On a sunny day, a tree and its shadow form the sides of a right triangle. If the hypotenuse is 
long and the tree is 28 meters tall, how long is the shadow?
A. 21 m B. 45 m C. 63 m D. 49 m