What is 221,000,000,000,000,000,000 expressed in scientific notation? a.2.21 × 1021 b.2.21e20 c.2.21e21 d.2.21e-20 e.2.21 × 10-21 f.2.21 × 10-20 g.2.21 × 1020 h.2.21e-21

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.