In a manufacturing facility, a technician monitors a periodic wave graph that tracks the oscillation of a high-precision cutting tool. Match each graphical feature with the specific technical information it provides for data analysis.

As a production analyst reviewing a continuous periodic graph that tracks a machine's pressure output over time, you are asked to determine all the specific moments when the machine's pressure dropped to exactly zero. Which mathematical property of the graph must you recall and locate to find these exact points?

A quality control analyst is examining a graph that tracks the fluctuating pressure of a valve. True or False: To find the $x$-intercepts of this graph, the analyst must identify the points where the graph intersects the vertical axis.

A technician is monitoring a graph that tracks the output of a machine over time. To find the exact output value ($y$) for a specific time ($x$), the technician must follow a standard visual procedure. Arrange the following steps in the correct order to evaluate a function value from its graph.

Identifying Starting Points on Performance Graphs

An acoustics technician is analyzing a continuous sound wave plotted on a coordinate graph, where the vertical axis represents air pressure and the horizontal axis represents time. The technician notes that the plotted pressure values oscillate strictly between a minimum of $-1$ and a maximum of ${}1$. By identifying this closed interval $[-1, 1]$ of all possible vertical output values on the graph, the technician has successfully identified the ____ of the mathematical function.