Which set of ordered pairs represents y as a function of x?
a) {(2, 5), (3, 1), (2, 1), (4, 7)}
b) {(3, 2), (4, 3), (5, 2), (2, 6)}
c) {(1, 3), (3, 5), (2, 5), (1, 6)}
d) {(4, 7), (4, 6), (4, 4), (4, 1)}

Can someone me with this? i’m not sure what to put for my equations.

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?

Find the distance of the blue line between the two labeled points. round to the nearest hundredth. a) 7.07 b) 7.21 c) 10 d) 5.12