Tabitha2002 Tabitha2002
  • 24-04-2018
  • Mathematics
contestada

Find the sum of the first 5 terms of the geometric series -2, -6, -18, …

Respuesta :

Banabanana
Banabanana Banabanana
  • 24-04-2018
a₁ = -2
a₂ = -6

[tex]r= \frac{a_2}{a_1}= \frac{-6}{-2} =3 \\ \\ \\ S_5= \cfrac{a_1(1-r^5)}{1-r}= \cfrac{-2(1-3^5)}{1-3}=\cfrac{-2(1-243)}{-2}=1-243=-242[/tex]

Answer: -242
Answer Link

Otras preguntas

Who was the English scientist who proposed the theory known as “natural selection”? A. Sir Robert Peel B. Ebenezer Scrooge C. Adam Smooth D. Charles Darwin
Which is a true statement about the Neolithic Revolution?
The Gold Rush of 1848 negatively impacted what group? Irish immigrants farmers women Native Americans
what is the 6th planet from the sun?
what does authors purpose mean
Why did the English monarch want to establish the colony of Georgia?
Imaginary lines going from the east to the west, but dividing the globe north and south? please help!
Which Muslim empire was known for its artisans who produced rugs and pottery? A. Mughal Empire B. Safavid Empire C. Ottoman Empire
what is the 6th planet from the sun?
Which country had a communist dictator, and fought on the side of the Allies? Select one: a. Germany b. Soviet Union c. Italy d. Spain