zoecyoungman zoecyoungman

18-01-2021
Mathematics

contestada

please help I don't know how to do this

please help I dont know how to do this class=

Respuesta :

mhanifa mhanifa

18-01-2021

Answer:

18

Step-by-step explanation:

Given AP with:

a₁= 28, aₙ = 79, Sₙ = 963

Use the formula:

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

Substitute given values and solve for n:

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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