Question

Find the sum of the first 9 terms of the sequence. Show all work for full credit.

2, -7, -16, -25

Answer 1

sorry, x-9. Keep subtracting 9 until you get 9 terms

Answer 2

Then add up the terms

Answer 3

2, -7, -16, -25, -34, -43, -52, -61, -70

Answer 4

great, now add them up

Answer 5

-306?

Answer 6

@10115658

Answer 7

yep, good job

Answer 8

Thats it ?

Answer 9

@10115658

Answer 10

ya that should be the answer, quick and easy

Answer 11

wanna help on another?

Answer 12

Start a new question and i'll have a look

Answer 13

Find the sum of the geometric sequence.

three divided by two, three divided by eight, three divided by thirty two, three divided by one hundred and twenty eight, three divided by five hundred and twelve

one divided by two hundred and fifty six
one divided by sixteen
one thousand twenty three divided by five hundred and twelve
341

Answer 14

first term a = 2
difference between terms, d = -9
looking for 9th term so use n = 9
formula sum of terms of an arithmetic progression
sum = a(n) = a(1) + a(n - 1) d
a(9) = 2 + (9-1)(-9)
2 - 72 = -70