emilygrubb emilygrubb

16-04-2021
Mathematics

contestada

fine the sum of the first 8 terms of the arithmetic series 2+7+12+...

Respuesta :

rijarafiquee rijarafiquee

16-04-2021

Answer:

156

Step-by-step explanation:

s8 = n/2 [2t + (n-1)(d)]

= 8/2 [2(2) + (8-1)(5)]

= 4 [4 + (7)(5)]

= 4 (4 + 35)

= 4 (39)

= 156

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