Nancy and bill collect coins. nancy has x coins. bill has 7 coins fewer than 2 times the number of coins nancy has. write and simplify an expression for the total number of coins nancy and bill have . simplify your answer .

If u give wrong answer ill report u : )

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false

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