7) A man can travel 13 km on his bicycle in 2 hours. At this rate, how far can he travel in 5 hours?

Answer is 32.5km
. . . . . . . . . . . . z. .

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.