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
hammer [34]
1 year ago
13

55. The sum of an infinite geometric series is five times the value of the first term. What is the common ratio of the series?

Mathematics
1 answer:
myrzilka [38]1 year ago
8 0

Answer:

r = 4/5

Step-by-step explanation:

Formula

Sum of an infinite geometric series = a / (1 - r)

Givens

Sum = 5*a

a = a

r = ?

Solution

5a = a/(1 - r)                   Divide both sides by a

5a/a = a / (a * (1 - r)       The a's on the right cancel

5 = 1 / (1 - r)                    Multiply both sides by 1 - r

5*(1 - r) = 1*(1 - r)/(1 - r)   The 1 - r s on the right cancel

5*(1 - r) = 1                     Remove the brackets.

5 - 5r = 1                        Subtract 5 from both sides

5-5 - 5r = 1 - 5               Combine

-5r = - 4                          Divide by - 5

r = 4/5  

You might be interested in
What is the 8th term of the geometric sequence 8,16,32
ratelena [41]

the 8th term of the geometric sequence 8, 16, 32 is 1024

<h2>Explanation</h2>

<u>we know that</u>

geometric sequence 8, 16, 32

<u>the </u><u>question</u><u> </u><u>is</u>

the 8th term

<u>the </u><u>answer </u><u>is</u>

first we have to find the ratio

\sf r=  \frac{ U_2}{U_1}  \\  \sf r=  \frac{ 16}{8} \\  \sf r = 2

than, we have to find the 8th term

\sf U_n = ar^{n-1} \\ \sf U_8 = 8 \times 2^{8-1} \\ \sf U_8 = 8 \times 2^7 \\ \sf U_8 = 8 \times 128 \\ \bold {\sf U_8 = 1024}

<h2>Learn more</h2>

About geometric pattern

brainly.com/question/16762536

<h2>Answer details</h2>

grade: 7th

subject: mathematics

chapter: sequence

keywords: geometric sequence

7 0
3 years ago
Which statements are true for the given quadrilaterals? Choose all answers that are correct. A. All trapezoids are quadrilateral
svetlana [45]
Trapezoids always have 4 sides, so this is true. All rhombuses have parallel sides, so B is true also. A trapezoid has two sides that are not parallel, so C is not true. (remember, you only have to find one instance where your statement is false for it to be false) And for D, all rhombuses are kite-shaped so D is not true. A and B are true. Hope this helps. :) 
8 0
3 years ago
Read 2 more answers
Find the product of x^2(4x-3)
TEA [102]

Answer:

4 x^3 - 3 x^2

Step-by-step explanation:

Expand the following:

x^2 (4 x - 3)

x^2 (4 x - 3) = x^2×4 x + x^2 (-3):

4 x^2 x - 3 x^2

x^2×4 x = x^(2 + 1)×4:

4 x^(2 + 1) - 3 x^2

2 + 1 = 3:

Answer: 4 x^3 - 3 x^2

8 0
3 years ago
Read 2 more answers
Put these fractions in order from least to greatest 1/8 3/5 2/4 4/6
Korolek [52]

Answer: 1/8 < 2/4 < 3/5 < 1/8

Step-by-step explanation:

3 0
3 years ago
For the right triangle shown, the lengths of two sides are given. Find the third side. Leave your answer in simplified, radical
KATRIN_1 [288]

The Pythagorean theorem tells you

... a² + b² = c²

so

... a² = c² - b² = 16² - 9² = 256-81 = 175

... a = √175 = √(25·7)

... a = 5√7

4 0
3 years ago
Other questions:
  • Karen read 20 pages of her book in a half hour. If she reads for 3 hours at the same rate , about how many pages of her book can
    14·2 answers
  • 56x700 :] just do your best
    7·2 answers
  • Find the difference and reduce to the lowest terms 12 4/9 - 8 5/6 =
    8·2 answers
  • Factor the following trinomials . <br><br> x2 + 2x - 35 <br><br> x2 - x - 12
    11·2 answers
  • The mean per capita income is 23,037 dollars per annum with a variance of 149,769. What is the probability that the sample mean
    9·1 answer
  • a circular stained glass window frame with a diameter 20 inches is divided into 8 congruent find the area of 3 of the 8 panes of
    15·1 answer
  • The weather outside was very abnormal. The temperature started out at 22°C in the morning and went to -3°C at noon. It stayed at
    8·1 answer
  • Determine whether the quadrilateral is a parallelogram using the indicated method​
    14·1 answer
  • N ÷ 10 exponent 2 = 0.123<br><br>(Help please)
    13·2 answers
  • What is the unknown value? that makes the statement below true? ______ is 40 percent of 280
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!