Find the largest open intervals where the function is concave upward.f(x) = x4 - 8x2
A. (-?, -2
/3), (2
/3, ?)
B. (-?, -2
/3)
C. None
D. (2
/3, ?)
Answer: A
Mathematics
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The graph of a function f is given. On the same axes, sketch the graph of f-1. 
A. 
B. 
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Find the angle of least positive measure that is coterminal with the given angle.-1341°
A. 81° B. 981° C. 261° D. 99°
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Simplify.
A. 0 B. ±8 C. 8 D. -8
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Use technology to compute r, the correlation coefficient.The following are costs of advertising (in thousands of dollars) and the number of products sold (in thousands): 
A. .6756 B. -.3707 C. .6112 D. .2635
Mathematics