fpuente725 fpuente725

07-10-2020
Mathematics

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Find the sum of the first 100 terms of the sequence: −30, −40, −50, −60 ,...

Respuesta :

elisha27 elisha27

08-10-2020

Answer:

D= -10

an=a+(n-1)d

a100=-30+(100-1)-10

a100=-30+99x-10

a100=-960

(n/2)(A1+an)

(100/2)(-30-960)

(50)(-990)

= -49500

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