What is the independent variable Will practicing basketball more often improve my ability to score more free throws

1. Time practicing
2. Type of basketball used
3.free throw score

Independent variable: variable that does not depend on another. Independent variables also influence dependent ones.
For example, practicing more basketball would improve ability to get more free throws (free throw depends on practicing) - free throw is dependent variable. The type of basketball is irrelevant; you can cancel that out, has nothing to do with context.

Solution: 1. Time practicing