Which of the sets of ordered pairs represents a function?

a = {(−5, 5), (−2, 2), (2, −2), (5, −5)}

b = {(4, 2), (3, −2), (9, 4), (11, −3)}

Can someone me with this problem i don't understand i need

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Asap (i need to finish this quick) graph complete the sequence of transformations that produces △x'y'z' from △xyz. a clockwise rotation ° about the origin followed by a translation units to the right and 6 units down produces δx'y'z' from δxyz.