A man traveled at 480 km in 9 hours. He traveled at 45 km/hr for part of the trip and at 60 km/hr for the remainder of the trip.
How far did he travel while driving at 60 km/hr?
Please help!!!

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.