What is 9th term of the arithmetic sequence whose 2nd and 6th terms are 107 and 87, respectively?

- anonymous

What is 9th term of the arithmetic sequence whose 2nd and 6th terms are 107 and 87, respectively?

- chestercat

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- anonymous

- anonymous

17?

- anonymous

To find the common difference d, use the formula
a1+4d=a5.
For us, a1 is
10 and a5 is 38.
10+4d=38
Now we can solve for d.
4d=28
d=7
Add the common difference to the first term to get the second term.
a2=a1+d=10+7=17

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- anonymous

yes its 17

- anonymous

Otay :)

- anonymous

np

- anonymous

No its not 17 :P

- anonymous

Mike .-. Stop bursting my bubble D':<

- anonymous

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- anonymous

I know trust me, ive literally been up 12 hours trying to do this lol. ive been wrong almost all night xD

- anonymous

^^^ are the possible answers.

- anonymous

Go slap that h o e they be wrong den!

- anonymous

Lmfao

- anonymous

▄︻̷̿┻̿═━一 The H O E ===> ʕ•ᴥ•ʔ

- anonymous

(ง'̀-'́)ง

- anonymous

Yeah I wish... I dont even know who the hoe is xD

- anonymous

His name is sam! ┬┴┬┴┤(･_├┬┴┬┴ S H I T he's coming hide! I gtg ttyl

- anonymous

Lol xD

- anonymous

@jakashaka123 Can you help?

- anonymous

@Vianne can you help?

- anonymous

Any help would be great!

- ZeHanz

There is no need for formulas in this case, because the numbers are small as are the differences between the terms involved.
There are four steps to go from the second to the 6th term. each step is the same size (arithmetic seq).
In those four steps you go from 107 to 87, so 20 less. That is 20/4=5 less each step.
I think you know now how to find the ninth number :)

- anonymous

so 122 then?

- ZeHanz

No, because the sequence decreases: 2th term is 107, 6th is 87.
Each next term is 5 less than the current one.

- anonymous

ops sorry, wrong way, so 72 lmao

- ZeHanz

Done!

- anonymous

Thank you sooo much :D

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