Nitrogen gas accounts for what percentage of the atmosphere? select one: a. approximately 50% b. 1% c. 99% d. 78% e. 0.03%

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

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

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale