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The first and second terms of an arithmetic sequence are 10 and 16 respectively.​ ​

  • Calculate the 11th term of the sequence
  • The sum of the first n terms of this sequence is -560. Calculate n.

 

in Mathematics by Diamond (67,402 points) | 91 views

1 Answer

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d=16-10=6

a=10

T11= 10+(11-1)6

       = 70

 

-560=n(2(10)+(n-1)6)/2

    - 1120=n(6n-14)

      6n^2 -14n + 1120=0

  n= undefined
by Diamond (42,982 points)

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