Question

marcos wants to know: does the type of gasoline put in a car effect how fast the car can drive? what is the independent variable? type of gasoline how much gas is put into the car how fast the car can drive which car the gas is put into

Explanation:

To identify the independent variable, we recall that the independent variable is the one that is manipulated or changed to observe its effect on another variable (the dependent variable). In this question, Marcos is testing how the type of gasoline affects the car's speed. So the variable being changed (manipulated) is the type of gasoline, while the speed of the car (how fast it can drive) is the dependent variable (the one being measured/affected). The other options (how much gas, which car, or the speed itself) do not fit the definition of the independent variable here.

Answer:

A. type of gasoline