(PLEASE ANSWER AM TIMED! WILL MARK RIGHT ANSWER AS BRAINLIEST AND WILL THANK AND RATE!)
*50 POINTS*

Triangle RST is rotated using the origin as the center of rotation. The preimage and image are shown in the graph below.

The figure is rotated counterclockwise. Which rotation could have taken place?

a 45° rotation

a 90° rotation

a 135° rotation

a 225° rotation

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias