Polygon ABCD is translated to polygon A'B'C'D point A is located at (1,5) and point A' is located at (-2,1) what is the distance from B to B'

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.

Im pretty sure it’s is b 1.6 mi