Part A
What is the ratio of the number of steps to the number of 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.

35=5×77=7×1when we simplify 7 by 7we will get 5 and 1, 5 divided by 1 is 5