Can you answer this im taking a test

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

What is the equation fort the alkaline zinc/manganese dioxide cell. a) anode b)cathode c)overall equations.

What physical property of gold makes panning a useful way to get gold from streams?