2. You need to get to your next class,150 meters away, and you can only walk in the hallways at about 1.5 m/s. How much time will it take you to get to your next class?

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.