Question

Can someone help me please need the answer ASAP

Answer 1

Answer: 445.5 (choice C)

Work Shown:

`S_n = (n)/(2)(a_1+a_n)\\\\S_(11) = (11)/(2)(8+73)\\\\S_(11) = 5.5(81)\\\\S_(11) = 445.5\\\\`

Adding the first 11 terms of this arithmetic sequence yields the sum 445.5