Which of the following properties could be used to rewrite the expression (1/3 + 2/7) + 3/4 as 1/3 + (3/4 + 2/7) ?

Can someone me with this? i’m not sure what to put for my equations.

The mountain springs water company has two departments, purifying and bottling. the bottling department received 67,000 liters from the purifying department. during the period, the bottling department completed 65,000 liters, including 3,000 liters of work in process at the beginning of the period. the ending work in process was 5,000 liters. how many liters were started and completed during the period?

Find the measure of angle y. a. 115° b. 65° c. 43° d. 22°