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anzhelika [568]
3 years ago
13

Find the 1st term of a sequence if the common difference = -2 and the 13th term =59

Mathematics
1 answer:
Marat540 [252]3 years ago
8 0

Answer:

83

Step-by-step explanation:

<u>Formula for 13th term:</u>

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

<u>Given</u>

  • t(13) = 59
  • d = -2
  • a = ?

<u>As per the formula for 13th term:</u>

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