Classify the function f(t) = 4t^4 - 9t^3 + 6t^2 + 7t + 3. Choose the correct answer.
Polynomial function
Rational function
Root function
The domain of f(t) = 4t^4 - 9t^3 + 6t^2 + 7t + 3 is
(Type your answer in interval notation. Simplify your answer. Use integers or