The legs in the right triangle below are 12 units long what is the value of x ?

Which expression will have the same sum as 3_8 + 1/4?

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?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?