georgios99 georgios99

29-04-2017
Mathematics

contestada

evaluate 7 sigma notation n=1 2(-2)^n-1

Respuesta :

29-04-2017

This is a geometric of the form:

a(n)=2(-2)^(n-1)

And the sum of any geometric sum is:

s(n)=a(1-r^n)/(1-r) in this case:

s(n)=2(1-(-2^n))/(1--2)

s(n)=2(1-(-2^n))/3 so

s(7)=2(1-(-2^7))/3

s(7)=2(1--128)/3

s(7)=2(129)/3

s(7)=86

Answer Link

josettea2004 josettea2004

04-03-2021

Answer:

the answer is D .86

Step-by-step explanation:

Answer Link

Otras preguntas

help help please tankyou:']

If the simple interest on 6000 for 3 years is 1,620 then what is the insterest rate

-m^8n^9-(36m^10n^12/9m^2n^3)

why did slavery start in the u.s.

Angle eight and angle B are complementary angles.Angle a measures 67°. What is the measure of angle B

Jade can travel 42 miles in 4 hours. Please calculate Jade's rate of speed. (round to 2 decimal places) A. 1.05 hours per mile B. 10.5 hours per mile C. 10.5 mi

What is the slope of the line that goes through the points (-4,-1) and (-2, 9)?

Worth a 100 points.....

suggest why the efficiency of energy transfer between the phytoplankton and fish is very low

What is the main organ of the cardiovascular system? Question 1 options: the lungs the heart the spleen the liver