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

The formula for the volume of a cylinder is V=pi * r^2 * h. Solve the formula for r

In which of the following countries would a person have the least religiouse freedom.

Questions: 1. "There is just one large lot left to build on, and the theater would use up all of that space." In this sentence, the word lot means: A. a great a

Which characteristic can help a nursing assistant portray a professional and positive attitude? A) Standing with arms folded across the chest B) Using slang whi

Find the missing sides (pls)

2-root3/root3. Rationalize the following equation

TRUE OR FALSE 1. Kabuki theatre is known for the stylization of its drama, the often-glamorous costumes worn by performers, and for the elaborate keishi/keisho

Mike earns $15 per hour and Sara earns $34 per hour. What is the relative change in wages from Mike to Sara?

a Scientists have observed that the average surface temperature of the Earth has been increasing. This increase has affected the oceans. Glaciers and ice sheets

A circle has a donated of 4.5cm a larger circle has a diameter of 24cm what is the aporximent diffrent in the circumference of the two circles