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NEED AN A !!!!!!!! MATH HELP!!!!!!!

NEED AN A !!!!!!!! MATH HELP!!!!!!!-example-1
User Jcxz
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2 Answers

3 votes
Nevermind, I was wrong. Ignore me. 
User Kartikeya
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5 votes
Plug n = 1 into the original formula to get
an = 14 - 9n
a1 = 14 - 9*1
a1 = 5
So the first term is 5

The common difference is -9 as this is the slope in front of the n term. This means each term is going down by 9 each time. Notice the second term is
an = 14-9n
a2 = 14-9*2
a2 = -4
and so on...

To get the nth term, we subtract 9 from the (n-1)st term
That's the same as saying

a_n = a_(n-1)-9

So all together, the rule is

a_n = a_(n-1) - 9\\ a_1 = 5

Final Answer: Choice B

User Oylenshpeegul
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8.5k points