Which statement best describes how the volume of a cube changes when the edge length is doubled to form a new cube? A. the volume of the new cube is 1/2 the volume of the original cube.

B. the volume of the new cube is 1/4 the volume of the original cube.

C. the volume of the new cube is 8 times the volume of the original cube.

D. The volume of the new cube is 4 times the volume of the original cube.​

Select the quadratic that has root x = 8 and x = -5

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

Which situation is an example of an observational study?