Answer:
18 units
Explanation:
You want the period of the trig function shown in the attached graph.
Period
The period is the horizontal distance between corresponding points on the curve.
If we choose the positive peaks as corresponding points, we observe that one of them has a horizontal coordinate of 1, and the other has a horizontal coordinate of 19. Then the period is ...
19 - 1 = 18 . . . units
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Additional comment
We called this a "trig function" because it could be either a sine function or a cosine function. The least shift will be 1 unit right for a cosine function. As a sine function, the least shift would be 3.5 units left.
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