Question

What is the sum of a 17-term arithmetic sequence where the first term is 7 and the last term is -105?

Answer 1

whoevers first

Answer 2

the formula for this is

Sum = ( n/2){ a + l)

whre n = number of terms , a = first term and l = last term

Answer 3

(-105-7)/16=-7(common difference)
(-105+7)(-105-7+7)/(-14)=-810

Answer 4

-833
-893
-913
-943
these are the choices

Answer 5

= 8.5 *(7 - 105)

Answer 6

= -833

Answer 7

833, but i got a positvie

Answer 8

Thank you!

Answer 9

yes i had a mistake. sorry :)