HELP ASAP PLS

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

Is the square root of 4 plus the square root of 16 rational?