Final answer:
The independent variable is time in seconds ("s"), and the dependent variable is the height in feet ("ft") that the helicopter reaches as it moves upward at a constant rate of 22 feet per second.
Step-by-step explanation:
In the context of the helicopter moving upward at a constant rate, the independent variable is time, typically measured in seconds ("s"), since it is the variable that you manipulate or that changes on its own, and the experiment or situation observes the effect this has on another variable. The dependent variable is the altitude or height the helicopter reaches, which is dependent on the time the helicopter has been moving upward; its units are typically in feet ("ft") in this scenario. As the helicopter ascends at a constant 22 feet per second, the height is dependent on the time elapsed.