The cost to rent a moving truck is a flat fee of $25 plus $0.60 per mile. The equation c = 25 + 0.6m models the cost, c, in dollars for the number of miles, m, traveled in the truck.
So you should know that an independent variable is a variable that is not changed by other variables but a dependent variable does change by other variables. So in this question, c is a dependent variable and m is an independent variable :)))) I hope this is helpful have a nice day