math help

[wet abyss]

I need help with this problem. I got 1675.92 for the answer and it was wrong.

[blazing hamlet]

use the summation function on your calculator
$\sum_{n=8}^{21} 100 + 0.2t^{2} - 1.1t$

[devout crown]

KingDavid

[blazing hamlet]

I got 1810.9

use 1810 p sure