Answer:

Step-by-step explanation:
Simply:

18 x 4 = 72
(9 x 2) x 4 = 72
9 x (2 x 4) = 72
Step-by-step explanation:
Q1. E
Q2. A
Q3. H
sorry if I'm wrong anyways
Q4. C
1/9 - 5/6
Convert both of them into denominators of 18.
2/18 - 15/18
Subtract the numerators and keep the denominator:
-13/18