A bucket is leaking. After 3 hours the bucket has leaked

Write the sentence as an equation. b increased by 281 is d

Which expression is equivalent to sq-80

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?