How do you make this equation?

Answer 1

I have an equation that so far like this: 0.051578e^(0.000000277798518x) = y

I would like to create an equation that would add all of the "y" values together, for example when x=0, y=0.051578. But when x=2, y=0.051578+0.051578014=0.103156014. This equation adds the "y"s together from the first equation.