Shclark2020 Shclark2020

05-06-2018
Mathematics

contestada

What is the sum of the arithmetic series 18 sigma t=1 (5t-4)

A. 783
B. 1,566
C. 819
D. 86

Respuesta :

jdoe0001 jdoe0001

05-06-2018

[tex]\bf \sum\limits_{t=1}^{18}~5t-4\implies \sum\limits_{t=1}^{18}~5t~~-~~\sum\limits_{t=1}^{18}~4\implies 5\sum\limits_{t=1}^{18}~t~~-~~\sum\limits_{t=1}^{18}~4 \\\\\\ 5\left[\cfrac{18(18+1)}{2} \right]~~-~~(18\cdot 4)\implies 5(171)~~-~~72 \\\\\\ 855-72\implies 783[/tex]

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