State which of the following sets of ordered pairs represent a function.

set a: (5, 2), (4, 3), (3, 4), (2, 5)

set b: (-1, -6), (0, 2), (1, 2), (3, 6)

set c: (2, 1), (4, 2), (2, 3), (8, 4)

a.

set c

b.

set b

c.

set a

d.

set a and set b

Emmanuel added 888 links per minute to his chain mail. allesia started 202020 minutes after emmanuel and added 131313 links per minute to her chain mail. how long had emmanuel worked when allesia caught up to him, and how many links had he added?