Question 173568
Which of the following are functions? The last two problems, i.e., b & c, are multi part relations consider all parts when determining whether or not these relations are functions. Explain your reasoning for a, b, and c. 
a. f(x) = x + 5 
b. f(x) = 3 if x>2 otherwise f(x) = -2 
c. f(x) = 7 if x>0 or f(x) = -7 if x<0 or f(x) = 7 or -7 if x = 0 
My solutions
a. Is a Function
b. Is a function
c. Is not a function because f(x) = 7 or -7 when x = 0 ? 
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Cheers,
Stan H.