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Which of the following relations are fun...

Which of the following relations are functions? Give reasons. If it is a function, determine its domain and range.
i) `{(2,1),(5,1),(8,1),(11,1),(14,1),(17,1)}`
ii) {`(2,1,(4,2),(6,3),(8,4),(10,5),(12,6),(14,7)}`
iii)`{(0,0),(1,1),(1,-1),(4,2),(4,-2),(9,3)(9,-3),(16,-4),
(16,-4)}`
iv) `{(1, 2),(1,3),(2,5)}`
v) `{(2,1),(3,1),(5,2)}`
vi) {`(1,2),(2,2),(3,2)}`

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