If two angles are vertical, then they are congruent. if two angles are congruent, then they have the same measure. the law of syllogism allows us to draw which conclusion?
a. if two angles are congruent, then they are vertical.
b. if angle abd is congruent to angle def, then they are vertical.
c. if two angles are vertical, then they have the same measure.
d. if two angles have the same measure, then they are vertical.

Order the equations from least to greatest based on the number of solutions to each equation.-4^x -1 = 3^(-x) – 2 -3x + 6 = 2^x+13^x – 3 = 2x - 2

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

If wxyz is a square, which statements must be true? plz < 3