anonymous
  • anonymous
find a_18 when a_1=27, d=-6
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Jhannybean
  • Jhannybean
Using an arithmetic sequence that follows the formula: \(a_n =a_1 +(n-1)d\)
anonymous
  • anonymous
-75 is my answer
Jhannybean
  • Jhannybean
\[\large a_{\color{red}{n}} = a_{\color{red}{18}}\] Therefore we can conclude \(n=18\). Let's see..

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Jhannybean
  • Jhannybean
That is correct :)
anonymous
  • anonymous
thank you, but i did it the long way, d=-6 a_1=27 a_n=?
Jhannybean
  • Jhannybean
Perhaps you can show me how you've solved it?
anonymous
  • anonymous
i did 27-6=21 21-6=15 15-6=9 and so on until i got to a18.
anonymous
  • anonymous
but what is a_n?
Jhannybean
  • Jhannybean
That's also a good way to go about finding it.
anonymous
  • anonymous
it cant be 27(18-1)-6.
Jhannybean
  • Jhannybean
And why do you think it cant be?
anonymous
  • anonymous
because i got 453
anonymous
  • anonymous
and -2754 if i do the negative sign, first answer (453) i did a minus sign
Jhannybean
  • Jhannybean
This is how I solved it.\[a_n = a_{18} \longrightarrow n=18\]\[a_n=27+(18-1)(-6)\]\[a_n=27 -102\]\[a_n=-75\]
anonymous
  • anonymous
thats why, i forgot the addition sign.
Jhannybean
  • Jhannybean
:)
anonymous
  • anonymous
thank you ma'am!
Jhannybean
  • Jhannybean
No problem and good luck!

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