The altitude of a triangle is increasing at a rate of 3 cm/min while the area of the triangle is increasing at a rate of 2 square centimeters per min. a) At what rate is the base of the triangle changing when the altitude is 10cm and the area is 100 square cm? Show the steps!

b) At what rate is the altitude of the triangle changing while the area of the triangle is increasing at a rate of 4 square centimeters per minute, the base is decreasing at a rate of 6 cm/min when the base is 10cm and the area is 100 square cm? Show the steps!

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