Final answer:
The domain of the function represented by the graph is 0 ≤ x ≤ infinity (or x ≥ 0).
Step-by-step explanation:
The domain of a function represents the set of all possible input values, or x-values, for which the function is defined. In this case, the graph represents the height of the soccer ball as a function of time. Since the ball is kicked up into the air from the ground, the time starts at 0 seconds and continues indefinitely until the ball reaches its highest point and starts to descend. Therefore, the domain of the function represented by the graph is 0 ≤ x ≤ infinity (or x ≥ 0).