Christa and Marlene opened their first savings accounts on the same day. Christa opened her account with $50 and plans to deposit $10 every month. Marlene opened her account with $30 and plans to deposit $15 every month. After how many months will their two accounts have the same amount of money? What will that amount be? Solve using System of Equations.

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