The diameter of a round skating rink is 14 m. Find the circumference of the rink to the nearest meter. ​

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Step-by-step explanation:

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No this is not a function.

Step-by-step explanation:

Function: In mathematics, a function is a binary relation between two sets that associates every element of the first set to exactly one element of the second set. Typical examples are functions from integers to integers, or from the real numbers to real numbers.

This is a function

1>3

2>4

3>6

4>3

Because 0 has two outputs it isn't a function