When mathematical and logic operations are not enough to satisfy your model design, regressions and machine learning can be just what you need.
Simple regression can be used to model single variable relationships. The graphic interface gives you instant feedback as to how your regression curve fits your sampled data. You can choose the degree of the regression to the one that best matches your samples.
When it comes to prediction from multiple variables, the multiple regression or ML.Net machine learning host can give excellent results