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
Juli2301 [7.4K]
3 years ago
7

PLEASE HELP!!!!!!!! What is the 8th term of this sequence? 1,-1/2,1/4,-1/8

Mathematics
1 answer:
Tom [10]3 years ago
7 0
This is a geometric sequence with first term 1 and common ratio -1/2.  r=-1/2.

a(n) = a(1)*(r)^(n-1). 

Check:  If n=2 our formula must return -1/2.  Does it?

a(2) =    1(-1/2)^(2-1)  =  (-1/2)^1 = - 1/2.  Yes.
a(3) should be 1/4.  Is it?     a(3) = (-1/2)^(3-1) = 1/4    Yes. 

Then a(8) = (-1/2)^(8-1) = (-1/2)^7 = -1 / 2^7  = -1/128 (answer) 
You might be interested in
Move point A 90° clockwise along the circle​
aleksley [76]
Move it to half way to the other side the way a clock moves.
8 0
2 years ago
Roger had a farm with a certain number of orange trees. he had to cut down 5 trees to control the insects. each of the remaining
Oksi-84 [34.3K]
41790/210 = 199
199 + 5 = 204.
3 0
3 years ago
Read 2 more answers
A pile of 15 boxes is 3 metres high. What is the depth of each box?
schepotkina [342]

Answer:

15 boxes=3m=300cm

1 box=300cm÷15

=20cm

5 0
3 years ago
Read 2 more answers
Find the value of x.
lapo4ka [179]

Answer:

i think the answer should be 8

Step-by-step explanation:

3 0
2 years ago
14 by 15 feet garden. if one bag of soil covers 20 square feet how many bags of soil
lesantik [10]
14*15 is 210 which his the entire area. now divide 210/20 you get 10.5 so you will need at least 11 bags
6 0
3 years ago
Read 2 more answers
Other questions:
  • Which function transforms the graph of y=x^2 so that it is first shifted up 3 units and is then reflected across the x-axis?
    8·2 answers
  • HELP PICTURE IS SHOWN
    8·1 answer
  • Someone please answer and show work quick (15 points) do b please
    8·1 answer
  • What is the vertex, y intercept, and a value of this equation? "y=-x^2-4x-1"?
    14·1 answer
  • What’s the factors of 72
    10·2 answers
  • 7. A man makes a simple discount note for $6,200, at an ordinary bank discount rate of 8.84%, for 40 days. What is the effective
    11·1 answer
  • Find the value of each of the following
    10·1 answer
  • Las unidades solo son 1 6 7 o són 167 unidades 6 decimas...No lo entiendo.
    13·1 answer
  • How many tons are equal to 32,000 pounds?
    10·2 answers
  • Find the hcf of 6 and 8 by prime factorization method <br>pls help? ​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!