2015 Countdown Problem #22: The Curve

Geometry Level 1

The image shows a part of a graph. Below are four equations:

I: $$y=\frac{2015}{e^x}$$

II: $$y=2015{e}^x$$

III: $$y={2015}^x$$

IV:$$y=e^{2015x}$$

Which equation(s), when plotted, will produce the graph above?

This problem is part of the set 2015 Countdown Problems.

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