imrealconfused imrealconfused

18-06-2016
Mathematics

contestada

What is the sum of the first nine terms of the geometric series where a1 = 7 and r = −3?

Respuesta :

18-06-2016

Sum of terms of a geometric series
Sn = a1 (r^n-1)/(r-1)
a1 = 1st term = 7
n = number of terms = 9
r = common ratio = -3

Sn = 7 ((-3)^8-1)/(-3-1) = -11480
Hence the sum is -11480.

Answer Link

Otras preguntas

t took Mr. Phillips 1.6 hours to run the 13.2 miles. What was his average speed? *

Is this a sentence fragment?While he was serving his residency at Eastern General Hospital

please help me ! How did Anglo American speculators in the 19th century perceive wealth in New Mexico? * O Mining O Land ownership O Reselling the land O Agric

true or false? serving others can give you a break from focusing on your personal problems

5074 divided by 0.25

What form of government does Nigeria have? A. Parliamentary B. Absolute democracy

More on Linear Equations & Linear Systems: Question 1 How many solutions does the system of equations below have? y - 2x + 2 y-r-1 Select one: none infinite

do you believe that third parties benefit or hurt the electoral process in the US?

Find the measures of the interior angles and write down the steps please help me and ill mark You brainliest!!!

Given A(4, 2) and B(-1, y) and the graph of line t below, find the value of y so that AB It.