A cross-country skier moves 28 meters westward, then 62
meters eastward, and finally 54 meters westward.
For this motion, what is the distance moved?

What are the choices

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.