A bag contains red and blue beads. The probability of picking out a red bead is r. One bead is picked out of the bag, its color noted, and then it is replaced. A second bead is then picked out. The probability that exactly one of those beads is 4/9. Find the possible values of r. Give your answers as fractions in their simplest form.

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

The sum of two numbers is 86, and their difference is 20. find the two numbers

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?