Answer:
The period of the given graph is approximately 13 hours;
[tex]13[/tex]
Explanation:
Given the graph in the attached image.
The period of a graph is the horizontal distance between two points over which a complete cycle occurs;
As shown in the figure below;
The two lowest points are at points;
[tex]\begin{gathered} (6,2.02) \\ \text{and} \\ (19,2.00) \end{gathered}[/tex]
The period will be the horizontal distance between the two points;
[tex]\begin{gathered} P\approx19-6 \\ P\approx13 \end{gathered}[/tex]
Therefore, the period of the given graph is approximately;
[tex]13[/tex]
