The Anwser Is -12 Because He Swam 12 Feet Deep And It Would Not Be The Other Answers Because He Did Not Swim More Down Into The Pool So It Would Be -12
You simplify the fraction by dividing 2 to the nominator and the denominator. So 24/2=12, 8/2=4, 6/2=3. You can only divide a root with a root number so in this case the root three doesn't get affected