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melisa1 [442]
3 years ago
13

Please help I don't know how to do this ​

Mathematics
1 answer:
Mars2501 [29]3 years ago
5 0

Answer:

  • 18

Step-by-step explanation:

<u>Given AP with:</u>

  • a₁= 28, aₙ = 79, Sₙ = 963

<u>Use the formula:</u>

  • Sₙ = 1/2n(a₁ + aₙ), sum of the first n terms

<u>Substitute given values and solve for n:</u>

  • 963 = 1/2n(28 + 79)
  • 963 = 1/2n(107)
  • 1/2n = 963/107
  • 1/2n = 9
  • n = 9*2
  • n = 18

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