By master equations I mean the most essential set of equations, often expressed in terms of variables that are known and unknown, from which you can derive your final answers. For example, if you need to find the values of two unknown variables, you should mark at least two simultaneous equations as your starting point, although you can mark additional intermediate equations/information of importance as well if you think that they are necessary.
If you need to give explanations, please mark the paragraph that contains them.
In grading, ONLY THE MARKED EQUATIONS/EXPLANATIONS AND MARKED ANSWERS WILL BE LOOKED AT. In addition, if you do not show your master equations/explanations and simply write your answers, you will automatically receive zero points. Please DO NOT mark intermediate numerical calculations or unnecessary information.