16. Joe has 5 sports cards. He bought 3 packs with
the same number of cards in each pack. If he
now has 35 cards in all, how many were in each
pack? Write an equation, and show how to solve
it algebraically. Verify your answer by substituting
it in your equation or by using algebra tiles.

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