Solving PDE Using MS EXCLE

I have 4 math problems ( partial differential equations )

The solution needs to be done using Excel :

one workbook – different sheet for each problem

please be organize in your solution and all the functions needs to work clearly

**** if you do not know how to solve it do not take it >>

I know how to solve it , but i have an exam tomorrow so i do not have the time

anyone how attempt to take the homework and solve it wrongly . I Will give him low feedback and report him to the website administration .