Royce is folding a piece of paper to make an origami figure. each time he folds the paper the thickness of the paper is doubles. the paper starts out flat with a thickness of 2 millimeters.

7.666270253x10 raised to the 18th power

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.