Answer:
19 units
Explanation:
You want the period of the cosine function shown on the graph.
Period
The period is the horizontal distance between points where the graph repeats itself. It is convenient to use midline crossings or peaks as points that are easily identified as corresponding.
Here, the peaks appear on grid lines, so we have used those to identify the period. The first peak is at x=1, and the second is at x=20. The difference of these coordinates is the period.
The period of this function is 19 units.
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