Suppose that in an election vo preference is sharply divided along gender lines. 40% of women will vote for Candidate A, the rest will vote for Candidate B; 70% of men will vote for Candidate A, the rest for Candidate B. Which of the following represents the lowest percentage of voters that
must be women on election day, in order that Candidate B wins the election?

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.