There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 3/7
.
There are 12 red marbles in the bag and each is equally likely to be chosen.
Work out how many marbles in total there must be.

125 tickets were sold for the jazz band concert for a total of $1,022. students tickets cost $6 each, and general admission tickets cost $10 each. how many of each kind of tickets were sold?

12x + 1 = 25 solve the following equation. then place the correct number in the box provided.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?