Which of the following are functions Expalin your reasoning for a,b,c. Keep the definition of a fuction strongly in a mind as you do this problem. Think about whether the relationship between f{x) and x is consistnet with being a function or not and explain your reasonong?

a. f(x) = 2 if x>1
f(x) = -1 otherwise

b. f(x)= 5 if x>0
f(x) = -5 if x <0
f(x) = 5 or -5 if x=0

c. f(x)= 10/x