Which number line can be used to find the distance between (4, –1) and (8, –1)?

1. 3/6 or 1/22. 1/123. 1/84. 1/105. 2/12 or 1/6

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Lil