What of the following real life relationship represent a function?​

What’s the range cuz i can’t find it?

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost

A23 – year – old male buys 100/300/100 liability insurance, collision insurance with a $100 deductible, and comprehensive insurance with a $250 deductible? what is his total annual premium? (a) $1142.00 (b) $1765.45 (c) $1770.10 (d) $1785.25