Brody’s car holds a maximum of 30 gallons of gas. The function f(g) = 1.95g models the relationship between the total cost of gas, f(g), and the number of gallons of gas purchased, g.

What is the most appropriate domain of the function?

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.