You multiple everything in the ( )’s with the number outside of the ( )’s
2. Tuesday
3.1/7 and 0.14
4. neither likely or unlikely because most days occur 52 times through out the year.
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All it takes for a relation to be a function is for each possible first number of a pair there's only one possible second number.
So if any of the sets has two pairs with the same first number, that one's not a function.
The last one has (3,2) and (3,5) so isn't a function.