Please create the following functions with python using for and while loops, thank you.

a) my_sum=1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+ 16 + 17 + 18 + 19 + 20

Write a loop to do the above summation more efficiently

b) my_list=[9,8,7,6,5,4,3,2,1]

Write a loop to print out each element in the list on a new line

c) x=1 y=2

____________________ z=x+y

x=y

y=z

Write a line of code on the blank line that will create a loop that will end when y is greater than 100