clayman647 clayman647

30-03-2021
Mathematics

contestada

What is the sum of the geometric sequence 1, 3, 9, ... if there are 14 terms? (5 points)

Respuesta :

marievivian7 marievivian7

30-03-2021

Answer:

287

Step-by-step explanation:

the formulae is Sn=n\2(2a+(n-1)d)

where n=14,

d=3

and a=1

therefore,

Sn=14\2(2*1+(14-1)3)

Sn=7(2+(13)3)

Sn=7(2+39)

Sn=7(41)

Sn=287

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