Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0)
B. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0)
C. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (-?, -3) and (3, ?); concave down on (-3, 3)
D. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (-?, -3) and (3, ?); concave up on (-3, 3)
Answer: A
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Use a CAS integration utility to evaluate the triple integral of the given function over the specified solid region.
over the rectangular cube 
A. 
B. 
C. 
D. 
Find the distance d(P1, P2) between the points P1 and P2.
A. 84
B. 14
C. 84
D. 2
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such that 
, 
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?
A. 
B. 
C. 
D. 
E. 
Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 41 grams, how much will remain after 94 years? Round your answer to four decimal places. ?
A. 9.5014 grams B. 0.2142 grams C. 0.0000 grams D. 10.2500 grams E. 37.4174 grams