where is \sqrt(20) located on a number line

a. between 4 and 4.5
b. Between 4.5 and 5
c. Between 5 and 5.5
d. Between 5.5 and 6

The square root of 20 is approximately 4.47. So it is located on the number line between 4 and 4.5.

Therefore, the answer is:

a. Between 4 and 4.5