sarabader411 sarabader411

11-01-2022
Mathematics

contestada

The 15th term of an arithmetic series is
143 and the 31st term is 183.
a) Find the first term and the common
difference.
b) Find the 100th term of the series.

Respuesta :

salamsaid940 salamsaid940

11-01-2022

Answer:

-1557

Step-by-step explanation:

a+14d=143

a+12d=183

--------------------

2d= -40

d= -20

a=183+240=423

a(100th)= 423+99*-20=423-1980= -1557

I hope that help =)

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