The volume of air, in liters, in the lungs of an average person during normal breathing is a function of time, in seconds. This function is modeled by the sine function graphed in the standard \((x,y)\) coordinate plane below. One of the following values is the period, in seconds, of this function. Which one?

Summary Submit Skip Question

The period refers to the time it takes to complete one full cycle. Based on the graph, it takes about 5 seconds to from one apex point (maximum) to the next.