Double check my answer ?

after plotting the data where x represents the length of the side of a polygon, and f(x) represents the area of the polygon, jack used technology and constructed an appropriate model to approximate the area of the polygon. use the model jack created to predict the area of a polygon that has a side length of 3.
f(x) = x^2 + 3x + 1.

answers:
1. 10
2. 18
3. 19
4. 20

my answer = 18

correct?

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