Which function has two x-intercepts, one at (0,0) and one at (4,0)? f(x) = x(x - 4) f(x) = x(x + 4) f(x) = (x - 4)(x - 4) f(x) = (x + 4)(x + 4)

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