Answer:
The flow rate is 138.95 mL per hour.
Step-by-step explanation:
We are given the following in the question:
Volume of solution = 2.64 L
1 L = 1000 mL
Volume of solution in mL =

Time period = 19 hour
Unit rate of flow =

Thus, the flow rate is 138.95 mL per hour.
The answer is b because -2x+1-1<=-35 = -2x<=-36
2 rows of 18 chairs are blue so that is 36 chairs. then 4 rows of 12 chairs are blue so that is 48 chairs 36 plus 48 is 84 total blue chairs