Identify the relation that is a function. number of apples purchased to the cost of the apples
days of the week to the months of the year
city name to state name
last name to phone number

Which expression gives the area of the triangle shown below

Me with this one question, and i'll upvote the brainliest answer

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?