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

Noah wants to buy a purebed golden retriever puppy that he sees for $499.By the time he goes to buy it, the price has increased to $599. Find the percent markup

Mark the statement if it describes one of the major steps in Napoleon’s climb to power. A. He rises in the French army after the beginning of the Revolution. B.

If it is the Spring Equinox in the Northern Hemisphere, what would conditions be like? A) Cool Temperature B) Cold Temperature C) Hot Temperature D) Warm Temper

For breakfast, Randy had two Egg Mc Muffins and a hash brown, totalling 750 calories. Jack only had one Egg Mc Muffin and a hash brown, totalling 450 calories.

Antar is flying a triangular-shaped kite. it has a height of 4 1/2 feet and a base of 5 3/4 feet. what is the area of Antar's kite?

60% of $120 is $_____

Yellow, magenta, and cyan are the primary ______ colors.

Which famous ruler of the Tang Dynasty was known as the Brilliant Emperor? A. Xuanzong B. Genghis Khan C. Yangdi D. Huizong

Floridian starch is characteristic energy storage material of which algae?

Which statement about the Sui Dynasty is correct? A. It proclaimed Islam as the state religion of China in the ninth century. B. It reunited northern and southe