Look at the box-and-whisker plot. What is the measure of the third quartile (Q3)?

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.

The only number less than 8 that can equal 12 would be 6, 36 is the dividend