Which systems of equations have infinite solutions?

Anyone know? will mark brainliest if correct!

Find the root(s) of f (x) = (x- 6)2(x + 2)2.

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours