The graph provided shows a downward-opening parabola, which represents a quadratic function. The maximum value of a quadratic function occurs at its vertex when the parabola opens downward.

From the graph:

• The vertex is located at the point $(0, 10)$.

Therefore, the maximum value of this function is 10.

Would you like more details on how to determine the maximum value from a quadratic function's graph or have any other questions?

Here are 5 related questions:

1. What is the general form of a quadratic equation?
2. How do you find the vertex of a quadratic function from its equation?
3. What does it mean when a parabola opens upward or downward?
4. How can you determine if a quadratic function has a maximum or minimum?
5. What is the significance of the axis of symmetry in a parabola?

Tip: For quadratic functions, if the coefficient of $x^2$ is negative, the parabola opens downward, and the function has a maximum value at the vertex.