Which of the following is a geometric sequence where a1 = 4 and r = 3? A) 4, 7, 10, 13, . . .
B) 3, 7, 11, 15, . . .
C) 4, 12, 36, 108, . . .
D) 3, 12, 48, 192, . . .

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?

How do you use the elimination method for this question? explain, because i really want to understand!

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.