Final answer:
The interval notation for a quadratic function depends on the solutions of the quadratic equation.
Step-by-step explanation:
The interval notation for a quadratic function can be determined based on the solutions of the quadratic equation. The general form of a quadratic equation is at² + bt + c = 0, where a, b, and c are constants.
In the given example, the quadratic equation has constants a = 4.90, b = -14.3, and c = -20.0.
Using the quadratic formula, the solutions of the equation can be calculated. The interval notation depends on the nature of these solutions, whether they are real or complex.