A bag contains 6 red marbles, 8 blue marbles, 5 green marbles and 1 yellow marble. Erin is going to pull marbles out of the bag, replacing the marble after each time. What is the probability that a red marble and then a green marble will be pulled out of the bag?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Find the area of a parallelogram with base 15 yards and height 21 2/3

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?