Given that Teresa wanted to test how the speed of sound waves change that is the dependent variable. The independent variable is the liquid density, which means that Teresa will vary the liquid density and then will measure the resultant liquid density. The dependent variable is that that changes is response to a change on other variable (the independent one), that is why the dependent variable in this experiment is the speed of sound waves.
Teresa wanted to test the effects of liquid density on the speed of sound waves. what is the dependent variable in her experiment?