1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Umnica [9.8K]
3 years ago
14

What is the sum of a geometric sequence 1, 3, 9, ... if there are 12 terms?

Mathematics
1 answer:
attashe74 [19]3 years ago
4 0
We know that
a1=1
a2=3
a3=9
a2/a1=3/1----> 3
a3/a2=9/3----> 3
<span>common ration r is equal to 3
number of terms n  is 12

The </span><span>Sum of geometric series is given by the formula
</span>Sum=a1*[1-r<span>^n]/[1-r]
</span>Sum=1*[1-3^12]/[1-3]-----> Sum=[1-3^12]/[1-3]----> [3^12-1]/[3-1]
<span>Sum=531440/2-----> 265720

the answer is
265720



</span>
You might be interested in
1. Find 3 rational numbers between −1//3 and 1/−5
Alborosie

Step-by-step explanation:

-1×5 1×3

------ -----

3×5 -5×3

=

-5/15 -3/15

-5/15×4/4 ;

-3/15×4/4

=

-20/60 ;

-12/60

you can write any 8 rational no. between them

please mark as brainliest answer as it will also give you 3 pts

8 0
3 years ago
Please help!
Andrei [34K]
According to my calculations the theoretical answer about to be given is number c
6 0
3 years ago
a vertical pole 10 ft. tall casts a 14-foot shadow. what is the angle of elevation of the sun to the nearest degree?
PtichkaEL [24]
Draw a right triangle.

tan(theta) = \frac{opposite}{adjacent}

tan(theta) = \frac{10}{14}

Arctangent (tan^-1) can be used to find theta.

tan^{-1}(\frac{10}{14})=theta

theta\ is\ approx\ \boxed{36\ degrees}

8 0
3 years ago
1 over 6th + 3 over 8th
miv72 [106K]
1/6+3/8
=8/48+18/48
=26/48
=13/24
5 0
3 years ago
Which undefined geometric term is described as a location on a coordinate plane that is designated by an ordered pair, (x, y)? d
Eddi Din [679]

Answer:

d- point

Step-by-step explanation:

edgnuity

6 0
3 years ago
Other questions:
  • Triangle △ABC has an altitude CD . Which of the three points, A, B, D are between the other two if angles A and B are both acute
    9·1 answer
  • How do you round 10703.36 to hundreds?
    13·1 answer
  • - 4x - 2y = -12 and 4x + 8y = -24<br> Pls help
    14·1 answer
  • What is the answer? Some please help!!
    9·1 answer
  • D+4/3D = 336 what is the number of d
    6·1 answer
  • A bowling alley charges a one-time fee of $5.50 to rent shoes and $3.50 per game. Write an equation that represents "y", the tot
    11·1 answer
  • Vienna bought 8 yards of fabric and paid $35.60. How many more
    9·1 answer
  • the diagram shows the distance between city P and city S and city T. which measurement is closest to x, than the distance betwee
    15·1 answer
  • Find the average of the following numbers: 124, 456 and 785
    7·2 answers
  • Find a new function g(x) transformed from f(x)=-x-2 such that g(x) is perpendicular to f(x) .
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!