Find the gradient field of the function.f(x, y, z) = x8y4 + 
A. ?f = (8x7 + 6x5)i + 4y3j - 
k
B. ?f = 8x7y4i + 4x8y3j - 
k
C. ?f = (8x7 + 6x5)i + 4y3j + 
k
D. ?f = 
i + 4x8y3j - 
k
Answer: D
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Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g), the ground is horizontal, and only the gravitational force acts on the objects. A projectile is fired with an initial speed of 591 m/sec at an angle of 45°. What is the greatest height reached by the projectile? Round your answer to the nearest tenth.
A. 8910.2 m B. 85.3 m C. 87,320.3 m D. 35,640.9 m
Match the statement with one of the graphs. ? Choose the correct letter for each question. ?
A.
B.
C.
D.
Use this graph to answer the question. 
Which month in 2006 had the lowest sales?
A. Month 3 B. Month 6 C. Month 8 D. Month 2
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.3
+ 9
A. 12
B. 84
C. 27
D. 12