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
disa [49]
2 years ago
10

For the geometric sequence 1,2,4 find a8

Mathematics
1 answer:
Dennis_Churaev [7]2 years ago
4 0
First, create a rule for this sequence.

Let a(1) be the first term (which here happens to be 1).

The next term, a(2), is twice the previous term, that is, twice 1, or 2.

a(3) = 2a(2) = 2(2) = 4

This is called a "recursive function."

The 3rd term is 4.  The next, which is a(3) is 2*4, or 8.


Note that there's an alternative approach.  The first term, a(1), is 1; the next is a(2) = a(1)*2^(2-1)   =  1*2^1=2
the next is a(3) = 1*2^(3-1) = 1*2^2 = 4

So the rule is   a(n) = a(1)*2^(n-1).

So a(8) is a(1)*2^(8-1)   =    1*2^7  = 2^3*2^4  =   8(16) = 128


You might be interested in
Identify the solution of each equation from the list given.
sp2606 [1]

Answer:

1.) The answer is b = 6

2.) The answer is t = 10

Step-by-step explanation:

For the first equation in order to fin out the answer we do.....

b + 8 = 14

b + 8 - 8 = 14 - 8

b = 6

For the second question we do....

25 - t = 15

25 - t + t = 15 + t

25 = 15 + t

25 - 15 = 15 + t -15

10 = t

4 0
3 years ago
I need this done asap
Norma-Jean [14]

Answer:

They both have 1/2

Step-by-step explanation:

For the first one there are 6 numbers and 3 of them are odd. That makes it 1/2.

For the second one it is self explanatory.

3 0
1 year ago
Read 2 more answers
The third mean of a GP of two numbers 27 and 1/27 is 1. Find the number of means. ​
Artyom0805 [142]

Answer:

The mean is \sqrt{3}.

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
What’s a complex conjugate in math
goldenfox [79]

Answer:


Step-by-step explanation:

In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign. For example, the complex conjugate of 3 + 4i is 3 − 4i. In polar form, the conjugate of is.

3 0
3 years ago
On the surface, it seems easy. Can you think of the integers for x, y, and z so that x³+y³+z³=8? Sure. One answer is x = 1, y =
rosijanka [135]

Answer:

Well ,lets see∉ if you add theose numbers togetherФ it maybe it he answer is 4=67 *64  ---4 67x54 5xe4t4 6x

7 0
2 years ago
Other questions:
  • Which expression represents 81? 1. 3^3 2. 3^4 3. 3^5 4. 3^6
    10·1 answer
  • I'm Sure no one will see or answer this correctly like always...
    9·1 answer
  • Sally has a steady babysitting job on Saturday nights. She charges $9.50 an hour plus 3.50 for each child she watches. How many
    10·1 answer
  • For what values of 0 is sin 0< cos0 when 0_<0< pie
    11·1 answer
  • A central angle of a circle intercepts an arc of length 18 centimeters. The radius of the circle is 9 centimeters. What is the m
    12·1 answer
  • Robin purchased 3 1⁄2 ounces of whole wheat cereal for $1.40. What is the cost per ounce
    8·1 answer
  • A t-shirt company has initial costs of $1200 per month and it costs them $3.50 per shirt.
    10·1 answer
  • Use the quadratic formula to find both solutions to the quadratic equation
    15·1 answer
  • Solution to 3/x + 2/(x+1) = 3/5x?
    15·1 answer
  • Part a: a circle is the set of all points that are the same distance from one given point. find an example that contradicts this
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!