Question

HELP ALG 2 SERIES
Find the 10th partial sum of the summation of 5i plus 2, from i equals 3 to infinity.

222

240

255

-355

Answer 1

@yomylola

Answer 2

You want
\[\large\sum_{i=3}^{12}(5i+2)\]
since \(i=12\) gives the tenth term in the series.

Answer 3

These formulas should help:
\[\large\sum_{i=1}^ni=\frac{n(n+1)}{2}\]
\[\large\sum_{i=1}^n1=n\]

Answer 4

I=3