11. Tyler told his friend this riddle: "I am thinking of a number. Three times my number plus twice
my number is twenty. What number am I thinking of?"
a. Write an equation that models Tyler's statement

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

What is the period of the sinusoidal function ?

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