Here are some resources for numerical methods for engineers that you may find helpful:
Runge-Kutta Methods (RK2 & RK4)
Coursera’s course forums are goldmines. Instructors and teaching assistants often post hints that lead to the answer. For example: numerical methods for engineers coursera answers
Quadrature and Interpolation: Using Simpson’s Rule or Gaussian Quadrature for integration, and Cubic Splines to fit curves through data points. Here are some resources for numerical methods for