Let {{MATH_7}} and let {{MATH_8}} What does {{MATH_9}} represent in this setting? {{CMD_10}} With {{MATH_11}} we first relate how far one can drive with {{MATH_12}} gallons of gas, and this in turn is determined by how much money {{MATH_13}} one has. Hence {{MATH_14}} represents how far one can drive with {{MATH_15}} dollars. {{CMD_16}} {{CMD_17}}