Help please!! ill give brainliest :)

Which is a graph of a proportional relationship?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

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