Register
PLEASE HELP!!! Use The Formula to evaluate the series 3 - 9 + 27 - 81 + . . . - a8 In the formula for a finite series a1 is the first term r is the common ratio and n is the number of terms. A. -19,680
106k views
4 votes
PLEASE HELP!!!

Use The Formula to evaluate the series 3 - 9 + 27 - 81 + . . . - a8

In the formula for a finite series a1 is the first term r is the common ratio and n is the number of terms.

A. -19,680

B. -9840

C. -4920

PLEASE HELP!!! Use The Formula to evaluate the series 3 - 9 + 27 - 81 + . . . - a-example-1
User Nwaweru
by
7.0k points

1 Answer

3 votes

r=-3, n=8, a_1=3

S = 3(1 - (-3)^8)/(1 - -3) = -4920

Choice C


User Menfon
by
7.9k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

8.5m questions

11.2m answers

Other Questions

What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!