Extrapolation When doing this, the Goal-Seek function comes quite handy Solving simultaneous linear equations using matrix algebra When doing this, use the minverse and mmult functions in Excel Finding roots of a polynomial When doing this, the Goal-Seek function comes quite handy Statistical analysis When doing this, use the stdev. s function given sample data Solve sets of non-linear equations or constraint optimization problems When doing this, Use the Excel solver Regression analysis (curve fit) When doing this, use best-fit curve that maximizes R^2 without wildly over-fitting Interpolation