Question

how do i find the sum of a series?

Answer 1

idk how to write it out. but the top is 4, the bottom is i=1 and the right side is 6i-5

Answer 2

\[\huge \sum_{i=1}^{4}6i-5\]
\[\large 1+7+...+19\]
Formula for the sum of an arithmetic sequence
\[\large S_{n}=\frac{n}{2}(a+l)\]
Where:
"a" is the first term
"l" is the last term
"n" is the number of terms in the series which is the top number of the SIGMA Notation.
\[\large =\frac{4}{2}(1+19)\]
\[\large =2(20)\]

Answer 3

thankyou