Which of the following are functions discuss and explain, Ask an Expert

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Which of the following are functions? Explain your reasoning for a, b, and c. Keep the definition of a function strongly in mind as you do this problem, it is not nearly as difficult as it may look. Think about whether the relationship between f(x) and x is consistent with being a function or not and explain your reasoning. Problems b & c are multi part relations so consider all parts when determining if they are functions.
a. f(x) = x 8
b. f(x) = 45 if x>2 otherwise f(x) = -4
c. f(x) = 4 if x>0 or f(x) = -4 if x<0 or f(x) = 4 or -4 if x = 0

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