The function of the curve is an exponential function. So, the function would be y = e^x.
When the expression of function is such that it involves the input to be present as an exponent (power) of some constant, then such function is called exponential function.
Their usual form is specified below. They are written in several such equivalent forms.
For example, [tex]y^x[/tex]
where a is a constant is an exponential function.
We can see that the curve of the function is decreasing constantly.
Thus, the function of the curve is an exponential function. So, the function would be y = e^x.
Learn more about exponential growth and decay here:
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