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loris [4]
2 years ago
6

The volume of a cylinder is 980 in. The height of the cylinder is 20 in. What is the radius of the cylinder? Express your answer

to the nearest hundredth.
Mathematics
1 answer:
andreyandreev [35.5K]2 years ago
5 0
R=\sqrt{} \frac{V}{ \pi r}

r=\sqrt{} \frac{980}{ \pi *20}

r≈3.95
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You measure a piece of rope and find its length to be 13 m. Find the percent error of this measurement. Round to the nearest hun
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What's the square root of 15 divided by 5 square root of 20?
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Answer:

√3/10 = 0.1732

Step-by-step explanation:

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7 0
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Find the vertex for the equation: <br> y = 3x^2 + 18x + 30<br> (-3, 3)<br> (-3, -51)<br> (3, 111)
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Find the radius of convergence, then determine the interval of convergence
galben [10]

The radius of convergence R is 1 and the interval of convergence is (-3, -1) for the given power series. This can be obtained by using ratio test.  

<h3>Find the radius of convergence R and the interval of convergence:</h3>

Ratio test is the test that is used to find the convergence of the given power series.  

First aₙ is noted and then aₙ₊₁ is noted.

For  ∑ aₙ,  aₙ and aₙ₊₁ is noted.

\lim_{n \to \infty} |\frac{a_{n+1}}{a_{n} }| = β

  • If β < 1, then the series converges
  • If β > 1, then the series diverges
  • If β = 1, then the series inconclusive

Here a_{k} = \frac{(x+2)^{k}}{\sqrt{k} }  and  a_{k+1} = \frac{(x+2)^{k+1}}{\sqrt{k+1} }

   

Now limit is taken,

\lim_{n \to \infty} |\frac{a_{n+1}}{a_{n} }| = \lim_{n \to \infty} |\frac{(x+2)^{k+1} }{\sqrt{k+1} }/\frac{(x+2)^{k} }{\sqrt{k} }|

= \lim_{n \to \infty} |\frac{(x+2)^{k+1} }{\sqrt{k+1} }\frac{\sqrt{k} }{(x+2)^{k}}|

= \lim_{n \to \infty} |{(x+2) } }{\sqrt{\frac{k}{k+1} } }}|

= |{x+2 }|\lim_{n \to \infty}}{\sqrt{\frac{k}{k+1} } }}

= |{x+2 }| < 1

- 1 < {x+2 } < 1

- 1 - 2 < x < 1 - 2

- 3 < x < - 1

 

We get that,

interval of convergence = (-3, -1)

radius of convergence R = 1

Hence the radius of convergence R is 1 and the interval of convergence is (-3, -1) for the given power series.

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