2+2 answer please help me

What is the measure of ac? 5 units 13 units 26 units 39 units

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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?