Question

find the indicated term of the given arithmetic sequence a1=115, d=-11, n=12

Answer 1

12th term is -6 I believe?

Answer 2

nice, can you please explain how you got that ? I want to learn it : /

Answer 3

First, An arithmetic sequence is a sequence where each term is found by adding or subtracting the same value from one term to the next. We call this value "common sum" or "common difference"

Answer 4

So pretty much we start from a1, which is 115, then subtract 11 since it's (-11) until we get to n which is 12

Answer 5

Another way to find the number is using this equation, (d) x (n) + (a1 plus or minus (d))

Answer 6

\[-11* 12 + (115-11)\]

Answer 7

For the last part of the equation you need to do the opposite of the given sign, so instead of subtracting 11, you add 11

Answer 8

\[-11*12+(115+11) = -6\]

Answer 9

Do you somewhat get it?

Answer 10

yeah i somewhat get it a little. thank you

Answer 11

Take a1 and add or subtract d depending on the sign, until you reach n.

Take 115 and subtract 11 (-11) until the 12th term. 115 would be the firt

Answer 12

1. 115
2. 115-11 =104
3. 104 -11 =93
4. 93-11 = 82
5. 82 -11 =71
6. 71 -11 = 60
7. 60 -11 = 49
8. 49 -11 = 38
9. 38- 11 = 27
10 27 - 11 = 16
11. 16 - 11 =6
****12th. 5- 11 = -6

Answer 13

Does that help a bit more?

Answer 14

Here is a reference site that can help you out.

http://www.basic-mathematics.com/arithmetic-sequence.html

Answer 15

yay ! okay i get it now it took me a minute but i definitely get it now. thank you very much

Answer 16

yw