1. 18 is 30% off what number 2. 10 is 25% of
3. 54 is 9% of
4. 45 is 75% of

Let d be the domain and let ƒ be the possible function. determine if the relation is an example of a function. d = {x| x is a date, expressed in day/month/year} ƒ(x) = temperature in seattle washington on that date