Let w represent the weight of the tank and water (in pounds). Let v represent the volume of water in the tank (in gallons). w is a function of v , and let's call this function f . So f ( v ) = w , and the formula is f ( v ) = 8.35 v + 22.6 . The graph of f is shown below. A graph of function f Untried What is the practical domain of f [the values of v that make sense as inputs to the function]? v What is the practical range of f [the values of f ( v ) that make sense as outputs from the function]? (Hint: you may have to use the function formula to answer this question.) f ( v )