Which number line model represents the sum of 3/4 + (-1.75)?

3/4 = c/36 i need with this fraction proble.

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

15. if the 8% tax on an item amounts to $0.96, what is the final price (tax included) of the item?