Let's analyze the graph to determine the required characteristics of the function:

1. Period: The period is the distance along the x-axis after which the function starts repeating itself. Observing the graph, the function repeats its pattern approximately every 10 units along the x-axis. So, the period is 10.

2. Maximum: The maximum value is the highest y-value the function reaches. From the graph, the maximum y-value is 5.

3. Minimum: The minimum value is the lowest y-value the function reaches. The minimum y-value is -5.

4. Midline: The midline is the horizontal line that represents the average of the maximum and minimum values. It is calculated as: $\text{Midline} = \frac{\text{Maximum} + \text{Minimum}}{2} = \frac{5 + (-5)}{2} = \frac{0}{2} = 0$ So, the midline is the line $y = 0$.

5. Amplitude: The amplitude is the distance from the midline to either the maximum or minimum value. Since the maximum is 5 and the midline is 0, the amplitude is: $\text{Amplitude} = \text{Maximum} - \text{Midline} = 5 - 0 = 5$

For the output value when $x = ?$, please provide the specific x-value you are interested in.

Would you like more details on any of these calculations?

Here are some related questions:

1. How do we calculate the period of a non-uniform periodic function?
2. What are the implications of a shifted midline for amplitude calculations?
3. How does the amplitude change if the midline is not at $y = 0$?
4. Can a function have multiple periods, and how would that affect the graph?
5. How would you determine the equation of this function based on its graph?

Tip: When identifying the period from a graph, always ensure that you check multiple cycles to confirm consistency.