Which of these tables represents a function?

a)

game number season 1 season 2

1 3980 3210

2 4060 4180

3 4190 3020

4 3820 3670

5 4100 5320

b)

x f (x)

0 - 1

1 0

2 - 1

1 - 2

c)

x f (x)

0 2

1 2

2 2

3 4

d)

x f (x)

1 - 2

0 - 1

1 - 2

4 1

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