Find the indicated vector.Let u = 
. Find -4u.
A. 
B. 
C. 
D. 
Answer: C
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Use the figure showing isotherms for the United States to answer the question. 
Which city has approximately the same temperature as Denver?
A. San Francisco B. Chicago C. Seattle D. New York
Solve.Two recording devices are set 3200 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 200 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
A. 1587.45 feet B. 1176.3 feet C. 428.57 feet D. 6148.17 feet
Find an antiderivative of the given function.f(x) = - 
A. 
B. - 
C. 
D. 
Solve the problem.A ladder that is 13 feet long is 5 feet from the base of a wall. How far up the wall does the ladder reach?
A. 
ft
B. 12 ft
C. 144 ft
D. 2
ft