How to generate equeation from the coefficients?

[newuser_01]

Thanks, found the residuals and I can write the equation, but it is not the perfect equation because I still can't forecast the future, because one of the parameter in the equation is the selected day's residual (i.e. actual value - predicted value) how can I predict that residual? I don't know theactual value and I won't be able to calculate the predicted value without knowing the residual.

[startz]

The expected value of the residual is zero.