Create a 2 - column proof.

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.

the answer would be c ≈ 18.852*3.14= 6.286.28*3=18.85

Ibelieve it is 5,040