Answer:
Step-by-step explanation:
16.
( (5)^2 - (1) ) ÷ 6
(25 - 1) ÷ 6
24 ÷ 6
4
18.
(2) - (4 - (3) - (2) ÷ 2)
2 - (4 - 3 - 1)
2 - (1 - 1)
2 - (0)
2
20.
(1 + 1)^2 - (5 - 5)
(2)^2 - (0)
