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Vikki [24]
4 years ago
14

Can anyone do this ??

Mathematics
1 answer:
Ilya [14]4 years ago
7 0

Answer:

I think is A tell me if I am wrong

Step-by-step explanation:

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A simple random sample of 30 residents from Seattle is taken to estimate the median income of all Seattle residents.
IRISSAK [1]

Answer:

The correct answer is Non-representative.

Explanation:

When a non-representative study is conducted. The researchers face or seek random samples in order to make their studies. On the other hand, a representative study is conducted with the purpose of looking for more specific or accurate samples.

3 0
3 years ago
Use Stokes' Theorem to evaluate S curl F · dS. F(x, y, z) = x2 sin(z)i + y2j + xyk, S is the part of the paraboloid z = 9 − x2 −
Korolek [52]

The vector field

\vec F(x,y,z)=x^2\sin z\,\vec\imath+y^2\,\vec\jmath+xy\,\vec k

has curl

\nabla\times\vec F(x,y,z)=x\,\vec\imath+(x^2\cos z-y)\,\vec\jmath

Parameterize S by

\vec s(u,v)=x(u,v)\,\vec\imath+y(u,v)\,\vec\jmath+z(u,v)\,\vec k

where

\begin{cases}x(u,v)=u\cos v\\y(u,v)=u\sin v\\z(u,v)=(9-u^2)\end{cases}

with 0\le u\le3 and 0\le v\le2\pi.

Take the normal vector to S to be

\dfrac{\partial\vec s}{\partial u}\times\dfrac{\partial\vec s}{\partial v}=2u^2\cos v\,\vec\imath+2u^2\sin v\,\vec\jmath+u\,\vec k

Then by Stokes' theorem we have

\displaystyle\int_{\partial S}\vec F\cdot\mathrm d\vec r=\iint_S(\nabla\times\vec F)\cdot\mathrm d\vec S

=\displaystyle\int_0^{2\pi}\int_0^3(\nabla\times\vec F)(\vec s(u,v))\cdot\left(\dfrac{\partial\vec s}{\partial u}\times\dfrac{\partial\vec s}{\partial v}\right)\,\mathrm du\,\mathrm dv

=\displaystyle\int_0^{2\pi}\int_0^3u^3(2u\cos^3v\sin(u^2-9)+\cos^3v\sin v+2u\sin^3v+\cos v\sin^3v)\,\mathrm du\,\mathrm dv

which has a value of 0, since each component integral is 0:

\displaystyle\int_0^{2\pi}\cos^3v\,\mathrm dv=0

\displaystyle\int_0^{2\pi}\sin v\cos^3v\,\mathrm dv=0

\displaystyle\int_0^{2\pi}\sin^3v\,\mathrm dv=0

\displaystyle\int_0^{2\pi}\cos v\sin^3v\,\mathrm dv=0

4 0
3 years ago
Help me plssss i need it asap
vitfil [10]

Answer:

C

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Please help me!!!! Thank you
serg [7]

\huge  \rm༆ Answer ༄

In the given question, the two sides of the given triangles are parallel, so the the two corresponding angles of the Triangles are equal to one another.

Therefore, the Triangles are similar by AA similarity criteria ~

And since they are similar, the ratio of sides of one Triangle will be equal to ratio of corresponding sides of the other Triangle.

that is ~

  • \sf \dfrac{5}{7}  =  \dfrac{5 + 6}{y}

  • \sf y = 11 \times  \dfrac{7}{5}

  • \sf y =  \dfrac{77}{5}

  • \sf y = 15.4

Hence, value of l = 15.4 units ~

3 0
3 years ago
What is the range of this function
Soloha48 [4]

Answer:

D

Step-by-step explanation:

The range is the values of y covered by the graph

The graph on the left shows y going to - ∞

The graph has its maximum value at 4 ( turning point )

The range is therefore

- ∞ < y ≤ 4

7 0
2 years ago
Read 2 more answers
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