Given that an object is at position 
at any time t , find each of the following.
a) v (t ) .
b) a(t ) .
c) The position, velocity and acceleration when t = 7?/12.
(a) 1/2 cos (2t)
(b) -sin (2t)
(c) 
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Solve the problem.The displacement s (in cm) of a linkage joint of a robot is given by s = (7t - t2)2/3, where t is the time (in s). Find the velocity of the joint for t = 5.2 s.
A. -1.08 cm/s B. -4.78 cm/s C. 0.95 cm/s D. -0.51 cm/s
Find the probability of the following card hands from a 52-card deck. In poker, aces are either high or low. A bridge hand is made up of 13 cards.In poker, a flush (5 in same suit) in any suit
A. 0.000495 B. 0.000347 C. 0.00122 D. 0.00198
Simplify. Include the absolute value symbol if necessary. If the answer is not a real number, state so.
A. x3 B. x9 C. x18 D. 9x
Write out the sum. Do not evaluate.
A. 6 + 7 + 8 + 9 B. 10 + 11 + 12 + 13 C. 7 + 8 + 9 + 10 + ... D. 7 + 8 + 9 + 10