Use sigma notation to write the sum. 6 6 6 + + 4 + 2 4 + 3 + 6 + 4 + 14 4 + 1 Use the summation formulas to rewrite the expression without the summation notation. n 12kk - 1) n3 k = 1 s(n) = Use the result to find the sums for n = 10, 100, 1000, and 10,000. n = 10 n = 100 n = 1,000 n = 10,000