What is the LCM of the numbers 9, 21 using prime factorizations

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?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.