Ajar contains 9 green marbles, 7 red marbles, 5 white marbles, and 4 yellow marbles. Two marbles are chosen from the jar one at a time. The first marble is NOT replaced before choosing a second marble.
P[red, then green)

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20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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?