Write a description of the set.E = {x | x ? N and 2 < x ? 19}
A. E is the set of natural numbers greater than 2 and less than or equal to 19.
B. E is the set of integers greater than 2 and less than or equal to 19.
C. E is the set of natural numbers greater than 19 and less than or equal to 2.
D. E is the set of natural numbers greater than or equal to 2 and less than 19.
Answer: A
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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.
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