Wouldn't the function just be the problem given? Well the fraction given..? How do you pull a function out of something with 2 variables?

Use the summation formulas to rewrite the expression without the summation notation. 8/ + 7 2 i=1 S(n) = Use the result to find the sums for n = 10, 100, 1000, and 10,000. 10 n= 100 n = 1,000 n = 10,000