anonymous
  • anonymous
What is the 25th term of the arithmetic series 9, 15, 21, ...? (3 points) 151 152 153 154
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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hartnn
  • hartnn
do u know the n'th term formula for arithmetic series?
anonymous
  • anonymous
I know the formula i just always have a hard time plugging numbers in
hartnn
  • hartnn
ok, 1st term a1 = 9 common difference d=15-9 = 6 n=25. plug them in and tell me what u get ?

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anonymous
  • anonymous
but you already put what they equal??
hartnn
  • hartnn
an = a+(n-1)d so, a25 = 9+(25-1)6 can u find a25 ?>
anonymous
  • anonymous
33*6 then?
anonymous
  • anonymous
but that isn't one of the answers I am doing something wrong
hartnn
  • hartnn
9+24*6=...?
anonymous
  • anonymous
you multiplt 24 by 6 first then add 9
hartnn
  • hartnn
first you multiply.
anonymous
  • anonymous
oh right. PEMDAS
anonymous
  • anonymous
153
anonymous
  • anonymous
very good!
hartnn
  • hartnn
yes.

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