starrhunter
What is the 25th term of the arithmetic series 9, 15, 21, ...? (3 points)
151
152
153
154



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hartnn
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do u know the n'th term formula for arithmetic series?

starrhunter
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I know the formula i just always have a hard time plugging numbers in

hartnn
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ok, 1st term a1 = 9
common difference d=159 = 6
n=25.
plug them in and tell me what u get ?

starrhunter
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but you already put what they equal??

hartnn
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an = a+(n1)d
so,
a25 = 9+(251)6
can u find a25 ?>

starrhunter
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33*6 then?

starrhunter
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but that isn't one of the answers
I am doing something wrong

hartnn
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9+24*6=...?

blondie16
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you multiplt 24 by 6 first then add 9

hartnn
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first you multiply.

starrhunter
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oh right.
PEMDAS

starrhunter
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153

blondie16
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very good!

hartnn
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yes.