A high school has 12 ninth grade teachers, 14 tenth grade teachers, 16 eleventh grade teachers, and 15 twelfth grade teachers. What is the ratio of ninth grade teachers, to the total amount of teachers in the high school?

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.

Ithink you’re answering is d