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
liubo4ka [24]
3 years ago
7

Identify whether the series sigma notation infinity i=1 15(4)^i-1 is a convergent or divergent geometric series and find the sum

, if possible.
a) This is a convergent geometric series. The sum is -5
b) This is a divergent geometric series. The sum is -5
c) This is a convergent geometric seties. The sum cannot be found.
b) This is a diveregent geometric series. The sum cannot be found.
Mathematics
2 answers:
const2013 [10]3 years ago
7 0

Answer:  The correct option is

(d) This is a divergent geometric series. The sum cannot be found.

Step-by-step explanation: The given infinite geometric series is

S=\sum_{i=1}^{\infty}15(4)^{i-1}.

We are to identify whether the given geometric series is convergent or divergent. If convergent, we are to find the sum of the series.

We have the D' Alembert's ratio test, states as follows:

Let, \sum_{i=1}^{\infty}a_i is an infinite series, with complex coefficients a_i and we consider the following limit:

L=\lim_{i\rightarrow \infty}\dfrac{a_{i+1}}{a_i}.

Then, the series will be convergent if  L < 1 and divergent if  L > 1.

For the given series, we have

a_i=15(4)^{i-1},\\\\a_{i+1}=15(4)^i.

So, the limit is given by

L\\\\\\=\lim_{i\rightarrow \infty}\dfrac{a_{i+1}}{a_i}\\\\\\=\lim_{i\rightarrow \infty}\dfrac{15(4)^i}{15(4)^{i-1}}\\\\\\=\lim_{i\rightarrow \infty}\dfrac{15(4)^i}{15(4)^{i}4^{-1}}\\\\\\=\dfrac{1}{4^{-1}}\\\\=4>1.

Therefore, L >1, and so the given series is divergent and hence we cannot find the sum.

Thuds, (d) is the correct option.

Vinvika [58]3 years ago
3 0

Answer:

B just took the test

Step-by-step explanation:

You might be interested in
Jennifer bought three buckets at the hardware store. The total cost was $19.95 for all
vladimir2022 [97]
$6.65 per bucket hat, I got this answer because $19.95 divided by 3 is $6.65 therefor leading to the cost of the bucket hats.
8 0
3 years ago
If y is proportional to the sqaure root of x and y equal x when x equal 5,evaluate y when x eqaul 9.​
Law Incorporation [45]

Answer:

y = 3\, \sqrt{5} when x = 9.

Step-by-step explanation:

The question states that y is proportional to \sqrt{x}. In other words, there is a constant a (a \ne 0) such that y = a\, \sqrt{x} for all x \ge 0.

The question also states that y = x when x = 5. Make use of this equality to find the value of a.

Since x = 5 and y = x, it must be true that y = 5. Substitute x = 5\! and y = 5\! into the equation y = a\, \sqrt{x} and solve for a:

5 = a\, \sqrt{5}.

\begin{aligned}a &= \frac{5}{\sqrt{5}} \\ &= \sqrt{5}\end{aligned}.

Thus, y = \sqrt{5}\, (\sqrt{x}) for all x \ge 0.

Substitute in the value x = 9 to find the corresponding value of y:

\begin{aligned} y &= \sqrt{5} \, (\sqrt{9}) \\ &= \sqrt{5} \times 3 \\ &= 3\, \sqrt{5}\end{aligned}.

6 0
2 years ago
What is the slope of the line that passes through the points (3 -1) and (-2 -5)
natima [27]
The slope is

(difference in y-values) / (difference in x-values)

= (-4) / (-5)

= 0.8
4 0
3 years ago
A large university accepts ​60% of the students who apply. Of the students the university​ accepts, 50​% actually enroll. If 10,
prisoha [69]

we need to find 1% of 10000 first

so we divide 10000:100= 100 (that's 1%)

to find the 60% which will be accepted we multiply 100 × 60 = 6000 students accepted

of those 6000 we need to find 50% which is ½ so we basically just divide by 2, aka 6000 : 2 = 3000 people which will be enrolled

3 0
2 years ago
Simplify the following expression and write in standard form: 3 x (6y - 4y + 5x) PLEASE HELP
mylen [45]

Answer: 15x^2+6xy

Step-by-step explanation: 3x(6y−4y+5x)

(3x)(6y+−4y+5x)

(3x)(6y)+(3x)(−4y)+(3x)(5x)

18xy−12xy+15x^2

15x^2+6xy

8 0
3 years ago
Other questions:
  • Mindie tosses a coin 50 times and gets 32 heads. Adam tosses the same coin 50 times and gets 28 heads. Cam tosses the coin 50 ti
    15·1 answer
  • 2x-y=10 and y=- 1/2 x+5​
    9·1 answer
  • To decide if 9cups are grater than 4 pints
    11·2 answers
  • You divide a number by 3 add 6 then subract 7 the result is 4
    7·1 answer
  • NEED HELP ASAP
    7·2 answers
  • Which direction does the graph of f(x) = 15x + 11 − x2 open?
    7·1 answer
  • Solve for p.<br><br> 4p + 19 + 13p = –17 − p
    5·2 answers
  • Tax on a $12, 985 car is 6%. what is the total price of the car​
    8·1 answer
  • Find the exact perimeter of quadrilateral ABCD plotted below. A-3,2) B(6,-2) D(0,-6) C(3.-6)​
    6·2 answers
  • Please help, explain in words the steps needed to solve this problem
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!