100 students are interviewed to see which of biology, chemistry or physics they prefer. 30 of the students are girls. 16 of the girls like biology best.
9 of the boys prefer physics.
2 out of the 34 who prefer chemistry are girls.
What percentage of the students prefer biology?

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.

Ibelieve the answer is c i worked it out three times but if my answer is wrong someone correct me