Tiana takes 3 hours to drive to the coast without stopping. how many minutes will it take her to reach the coast if she stops to rest for 20 minutes?

3 hours is 180 minutes.

She rested for 20 additional minutes, thus it will take her 200 minutes.

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.