Abag contains 25 marbles: 10 black, 13 red, and 2 blue. a marble is drawn from the bag at random. what is the probability of getting a red or a blue marble? 3/5 2/3 1/2 1/6

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.

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