Here is a trapezium drawn on a centimetre grid (not drawn to scale). Work out the area of the trapezium, stating the units of your answer.

Empty box + box + empty box fill in the box is equal to 30 how

A+b= 17, ab=70, find the value of |a-b|

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