If you use a computer-based algebra system (e.g., Mathematica) to assist you in your calculations, you should attach a printout that includes the commands and results (algebraic or graphical) that you produced. You may use a calculator to do routine arithmetic; if you use a calculator for more sophisticated purposes (e.g., curve fitting or equation solving), you must explain in detail the method that you are using, why it is correct to do so, and why the answer is complete.