anonymous
  • anonymous
Find the 9th term of the arithmetic sequence. a7 = -42 and a11 = -28; a9 = ____.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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campbell_st
  • campbell_st
so a really simple solution to this is to find the average of the 7th and 11th term, the average will be the 9th term (-42 + (-28))/2 =
anonymous
  • anonymous
-35?
campbell_st
  • campbell_st
the reason for using this method is to recognise that (7 + 11)/2 = 9 so the average of the 2 terms is the 9th term a quick and dirty solution

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campbell_st
  • campbell_st
-35 is correct
anonymous
  • anonymous
thanks

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