Given the following formula for v=4r. how would you solve for "r"?

Which is an equation for the nth terms of the sequence 12,15,18,21

10% of 1,900,000. show me how you got the answer

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