Which one of the following rational number is equal to 2.8 repeating

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?

Simplify using positive exponents only.

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.