How many is?
with procedure and testing
3x - 8 = x + 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?

Acircle has a circumference of 28.36 units what is the diameter of the circle

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me