Acompound experiment consists of drawing at random twice without replacing from a jar with 3 red, 3 white, and 2 black marbles. what is the probability of getting first a red and then a black marble?

The solution to your problem about the probability of getting first a red and then a black marble is as follows:

(3 red / 8 total) * (2 black / 7 total) = 3/28 

Therefore, the probability of getting first a red and then a black marble is 3/28.

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B, 0.4 repeats so it is rational and square root of 16 is 4 so that is rational as well.