Rectangle 1 has length 10 and width 20. rectangle 2 is made by multiplying each dimension of rectangle 1 by a factor of k=3. (a). are rectangle 1 and rectangle 2 similar?
(b). show that the perimeter of rectangle 2 is k times the perimeter of rectangle 1.
(c). show the the area of rectangle 2 is k^2 times the area of rectangle 1​

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

What is the measure of angle x? answer

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