What’s the rate of change for this question?

2.5 milligrams is equivalent to how many grams

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

If a sprinkler waters 1 over 12 of a lawn in 1 over 2 hour, how much time will it take to water the entire lawn? (5 points) 10 hours 6 hours 1 over 6 hour 7 over 12 hour