Writing an Integral Midpoint,Trapezoidal,Simpson Rule

I need Help in writing an expression in excel for the attached question:
a) Midpoint Rule
b) Trapezoidal Rule
c) Simpson

I have found one document that solves the simpson method and modified it to work with my given equation but not sure if its right or not(Check the Simpson-modified excel file attached)




Integral.pdf
Simpson-Modified.xls