Question

The sum of the first 17 terms of an arithmetic sequence is 1,360. If the first term is 16, find the 17th term.

Answer 1

ohh.... SUM of the first terms .... i had it a little offish

Answer 2

use the formula
Sn = n/2 [ a + l ]

Answer 3

What does everything stand for?

Answer 4

ok Sn = sum of n terms , n = number of terms, a = first term and l = last term.
you have value of everything except l which is what you need to find.
n=17, a = 17 and Sn = 1360

Answer 5

sorry a = 16

Answer 6

r u happy with solving the formula for l ?

Answer 7

I'm having a hard time :/

Answer 8

the sum of an arthritic series is rather ingeniously:

number of terms (first term + last term)
--------------------------------- = sum of series
2

i believe

Answer 9

for example:

3+6+9+12 should equal:

4 (3+12)
------- = 2(15) = 30
2

18
12
---
30

Answer 10

I answered it in the previous post..:-)

Answer 11

so we area given:

17 terms of an arithmetic sequence is 1,360.

If the first term is 16, find the 17th term.

1360 = 17 (16 + A)/2

1360(2) = 17 (16 + A)

1360(2)
------- = 16 + A
17


1360(2)
------- - 16 + A
17

Answer 12

1360(2)
------- - 16 = A ; where A is the last term, in this case #17
17

Answer 13

.... if you come to 144 youll do good ;)

Answer 14

Or the next post....:-)

Answer 15

Omg I didn't check back on that estudier. Thank you guys so much :)