ImmortalFusedZamasu
ImmortalFusedZamasu ImmortalFusedZamasu
  • 07-07-2018
  • Mathematics
contestada

Find the 29th term of the following sequence.

13.1 3.1 -6.9 -16.9, . . .

A. -286.9

B. -266.9

C. -296.9

D. -276.9

Respuesta :

Banabanana
Banabanana Banabanana
  • 07-07-2018
Arithmetic sequence
a
₁ = 13.1;  a₂ = 3.1;  a₃ = -6.9; a₄ = -16.9...   a₂₉ = ?

the common difference:
d = a₂ - a₁ = 3.1 - 13.1 = -10

29th term:
a₂₉ = a₁ + d(n-1)
      = 13.1 + (-10)(29-1)
      = 13.1 -10*28
      = 13.1 - 280
      = -266.9
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