A bag contains 5 red marbles, 3 green marbles, and 2 blue marbles. What is the probability of picking a red marble, then a green marble without replacing the red marble?

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.