Hi I need to know the Independent variable, the dependent Variable and Constants for 9 problems here's the first one A study was done to find if different tire treads affect the breaking distance of a car.

The independent variable is tire treads. An independent variable is the part of an experiment that is changed by the scientist.

The dependent variable is braking distance. A dependent variable is the part of an experiment that is measured by the scientist.

The constant is the type of car. A constant is a quantity that is unknown but assumed to have a fixed value in a specified mathematical context. It cannot be changed or is purposely unchanged during the experiment.