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 .