Answer
from least to greatest:
-20, 0.2, 1/2, square root of 2
Work Step by Step
Put all of the numbers in decimal form:
the square root of 2 is 1.414213562, which is approx. 1.4, and
1/2 is 0.5.
From least to greatest:
-20, 0.2, 1/2, square root of 2.