Respuesta :

mhanifa

Answer:

83

Step-by-step explanation:

Formula for 13th term:

t(13) = a + 12d, where a- first term, d- common difference

Given

  • t(13) = 59
  • d = -2
  • a = ?

As per the formula for 13th term:

  • 59 = a + 12*(-2)
  • 59 = a - 24
  • a = 59 + 24
  • a = 83

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