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(A tank with a solution of caustic liquid is is inially at a given concentration and volume. An upset occurs, and the supply flow rate and the inlet concentration drops down. Required is the tank concentration. Ref. Jeff Munic. Rev. 11.12.2018)

Math. Runge-Kutta application to a tank with variable concentration. Jeff Munic

Math. Runge-Kutta application to a tank concentration. Jeff Munic.xls

(A brine solution of water is added at a given flow rate to a tank with pure water. The volume in the tank is maintained at a constant volume with an overflow drain. Required is the concentration change with time. Ref. Jeff Munic. Rev. 11.12.2018)

Math. Runge-Kutta application to a tank concentration. Jeff Munic

Math. System of nonlinear equations solved with the Newton-Raphson method, in Excel and VBA.xls

(Solution of a system of nonlinear equations using the Newton-Raphson method, in Excel and in Visual Basic.. Rev. 30.10.2018)

Math. System of nonlinear equations solved with the Newton-Raphson method, in Excel and VBA

Math. System of linear equations solved with matrix inversion method, in Excel and in VBA.xls

(Solution of a system of linear equations using the matrix inversion method, in Excel and in Visual Basic.. Rev. 10.03.2016)

Math. System of linear equations solved with matrix inversion method, in Excel and in VBA

Math. Straight line which passes through points A and B, in a Log-Log , in a Log-Nat and in a Nat-Nat plot.xls

(Straight line which passes through points A and B in a Log-Log graphic, in a Log-Nat graphic and in a Nat-Nat graphic. Rev. 14.01.2017)

Math. Straight line which passes through points A and B, in a Log-Log , in a Log-Nat and in a Nat-Nat plot

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(Regression using the least squares method, for a stright line and parabolas of second, third, fourth, fifth and sixth grade. Rev. 23.01.2019)

Math. Least squares method. Regressions linear, second to sixth grades parabolas and exponential curve