Based on the side lengths given (a, b, and c), which triangles are right
a. a=4, b=6, c=8
b. a=6, b=8, c=10
c. a=5, b=6, c=(square root of) 61
d. a=6, b=9, c=12

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?

Can someone me out here and the tell me the greatest common factor

Can someone me with these two circle theorem questions asap?