A team of college administrators captured and tagged a group of 90 fraternity men and then returned them to the university campus. Later a group of sorority women wishing to estimate the number of fraternity men on campus captured 245 men and found that 35 of them were tagged. How many frat men would they estimate there were on this campus?

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.