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Komok [63]
3 years ago
13

PLEASEE help me please I’m so confused :( marking the first best answer as brainliest

Mathematics
2 answers:
mixas84 [53]3 years ago
7 0

I wrote it roughly.

Hope it helps.

I am sorry.

Andrews [41]3 years ago
3 0

Answer:

1 look pic

2 1/75

3 21/75 = 7/25

Step-by-step explanation:

hope it help

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What Place Value position is the 5 in the number 0.059<br>​
Rama09 [41]

Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
(a) Suppose anxn has finite radius of convergence R and an ≥ 0 for all n. Show that if the series converges at R, then it also c
valina [46]

Answer:

a) See the proof below.

b) \sum \frac{(-x)^n}{n}

Step-by-step explanation:

Part a

For this case we assume that we have the following series \sum a)n x^n and this series has a finite radius of convergence R and we assume that a_n \geq 0 for all n, this information is given by the problem.

We assume that the series converges at the point x= R since w eknwo that converges, and since converges we can conclude that:

\sum a)n R^n < \infty

For this case we need to show that converges also for x=-R

So we need to proof that \sum a_n (-R)^n < \infty

We can do some algebra and we can rewrite the following expression like this:

\sum a_n (-R)^n = \sum (-1)^n a)n R^n and we see that the last series is alternating.

Since we know that \sum a_n x^n converges then the sequence {a_n R^n} must be positive and we need to have lim_{n\to \infty} a^n R^n = 0

And then by the alternating series test we can conclude that \sum a_n (-R)^n also converges. And then we conclude that the power series a_n x^n converges for x=-R ,and that complete the proof.

Part b

For this case we need to provide a series whose interval of convergence is exactly (-1,1]

And the best function for this \frac{(-x)^n}{n}

Because the series \sum \frac{(-x)^n}{n} converges to -ln(1+x) when |x| using the root test.

But by the properties of the natural log the series diverges at x=-1 because \sum \frac{1}{n} =\infty and for x=1 we know that converges since \sum \frac{-1}{n} is an alternating series that converges because the expression tends to 0.

6 0
3 years ago
The proof shows that ABCD is a rectangle. Which of the following is the missing reason?
patriot [66]

Answer:

Side-side-side postulate

Step-by-step explanation:

In the first statement, we are given that AC = BD ....... (1){It is given}

Now, in the second statement, we are given that AB = DC ...... (2){ Because the parallelogram has equal opposite sides}

Now, again we are given that AD = DA ........... (3) {From the symmetric property}

Now, conditions (1), (2), and (3) are applicable to say that Δ ABD and Δ ACD are congruent.

Since there are three sides involved to say Δ ABD ≅ Δ ACD, so it is by Side-side-side postulate. (Answer)

4 0
4 years ago
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