Question

what is the sum of the series below?

Answer 1

\[\sum_{i=1}^{6} (7i-2)\]

Answer 2

\[\sum_{i = 1}^{6}7i - \sum_{i = 1}^{6} 2i^0\]That's a hint, eh?

Answer 3

\[\sum_{i = 1}^{6} 7i = 7 + 14 + 21 + 28 + 35 + 42 = 147\]and\[\sum_{i = 1}^{6}2i^0 = 2 + 2 + 2 + 2 + 2 + 2 = 2\cdot 6 = 12 \]