Solve the application problem.Two trucks leave Rainmaker Sprinkling Systems at the same time. One truck moves due west at 
whereas the other truck moves due south at 44 mph. How long does it take before the trucks are 385 miles apart?
A. 7 hr
B. 8 hr
C. 6 hr
D. 10 hr
Answer: A
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A. 
B. 
C. 
D. 
Find the unit vector in the direction of the given vector. Write your answer in the indicated form.Let u = 
. Find the unit vector in the direction of u, and write your answer in component form.
A. 
B. 
C. 
D. 
The polar coordinates of a point are given. Find the rectangular coordinates of the point.
A. 
B. 
C. 
D. 
Solve the problem.John (whose line of sight is 6 ft above horizontal) is trying to estimate the height of a tall oak tree. He first measures the angle of elevation from where he is standing as 35°. He walks 30 feet closer to the tree and finds that the angle of elevation has increased by 12°. Estimate the height of the tree rounded to the nearest whole number.
A. 67 ft B. 86 ft C. 90 ft D. 61 ft