Me. i have no idea what i'm doing there are 23 questions and this is for connections academy algebra t1 lesson 10 unit test. p. s if you know the other answers leave them won't let me post more screen shots

Measures of the angle of r, 31 s (x+4) t (3x+9)

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?

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).