Find the angle between the vectors u and v. Express your answer in degrees and round to the nearest tenth of a degree.
u = 5i+5j+3k, v = 8i+8j+2k
A. 44.3°
B. 77°
C. 45.7°
D. 13°
E. 90°
Answer: D
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Use the limit definition of the partial derivative to compute the indicated partial derivative of the function at the specified point.Find 
at the point (-9, -4): f(x, y) = 10 - 5xy + 4xy2
What will be an ideal response?
Find  figure.png)
(t) and  figures 4.png)
(t) for r(t) = 10ti+7t²j+5t³k.
What will be an ideal response?
Find the distance between the pair of points. Give your answer in exact form and where appropriate find an approximation to three decimal places.
and 
A. 
? 0.808
B. 
? 0.439
C. 
? 0.714
D. 
? 4.048
Solve.The manager of a bulk foods establishment sells a trail mix for $10 per pound and premium cashews for $13 per pound. The manager wishes to make a 150-pound 
mixture that will sell for $12 per pound. How many pounds of each should be used?
A. 100 pounds of trail mix 50 pounds of cashews B. 125 pounds of trail mix 25 pounds of cashews C. 75 pounds of trail mix 75 pounds of cashews D. 50 pounds of trail mix 100 pounds of cashews