What is -2 1/6 + 3 5/8? I’m really confused on adding and subtracting fractions, can someone please explain?

What is the approximate circumference of the circle shown below?

Match each polynomial with its factorization.

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?