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Makovka662 [10]
3 years ago
7

A college administrator knows that 70% of the students at her college are from out of state, so she decides to make sure that sh

e includes 70 out-of-state students and 30 in-state students in her survey about admission practices at the college. She has a list of all the out-of-state and in-state students currently enrolled at the college. She randomly selects 70 students from the out-of-state list and 30 students from the in-state list. Which sampling method is she using?
Mathematics
1 answer:
AURORKA [14]3 years ago
7 0

Answer:

stratified random sampling

Step-by-step explanation: Hope this Helps PLZ give brainlest :)

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Find an equation of the sphere with center (2, -6, 4) and radius 5. Describe its intersection with each of the coordinate planes
Setler [38]
Since this is a 3D object, the center of the sphere has 3 coordinates:  x=2, y = -6 and z = 4.

The equation would be:

(x-2)^2 + (y+6)^2 + (z-4)^2 = 5^2 (answer).

To find the equation of the intersection of this sphere with the xy plane, let z = 0.  Then (x-2)^2 + (y+6)^2 + (0-4)^2 = 25

This simplifies to (x-2)^2 + (y+6)^2 = 5^2 (or 25).

Find and describe the sphere's intersections with the other 2 coord. planes.

8 0
3 years ago
Simplify 3(2x + 5) <br> A. 6x + 30 <br> B.6x + 15<br> C. 6x + 5
Nana76 [90]

3(2x/5)  

Final result :

 6x

 ——

 5  

Step by step solution :

Step  1  :

           x

Simplify   —

           5

Equation at the end of step  1  :

          x

 3 • (2 • —)

          5

Step  2  :

Final result :

 6x

 ——

 5

5 0
4 years ago
Read 2 more answers
What is the coefficient in the expression 13.25d+6.5
tester [92]

Answer:19.75d

Step-by-step explanation:

7 0
3 years ago
Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z = xyi + 5zj + 7yk,
Helga [31]
The intersection can be parameterized by

C:=\mathbf r(t)=\begin{cases}x(t)=6\cos t\\y(t)=6\sin t\\z(t)=5-6\cos t\end{cases}

with 0\le t.

By Stoke's theorem, the integral of \mathbf f(x,y,z)=xy\,\mathbf i+5z\,\mathbf j+7y\,\mathbf k along C is equivalent to

\displaystyle\int_C\mathbf f(x(t),y(t),z(t))\cdot\mathrm d\mathbf r(t)=\iint_S\nabla\times\mathbf f\,\mathrm dS

where S is the region bounded by C. The line integral reduces to

\displaystyle\int_0^{2\pi}(36\sin t\cos t\,\mathbf i+(25-30\cos t)\,\mathbf j+42\sin t\,\mathbf k)\cdot(-6\sin t\,\mathbf i+6\cos t\,\mathbf j+6\sin t\,\mathbf k)\,\mathrm dt
=\displaystyle\int_0^{2\pi}(54(\cos3t-\cos t)-30(3\cos2t-5\cos t+3)+(126-126\cos2t)\,\mathrm dt
=\displaystyle\int_0^{2\pi}(36+96\cos t-216\cos2t+54\cos3t)\,\mathrm dt
=72\pi
4 0
4 years ago
Prove that cos^3x+3cos2x= 4 (cos^6 x-sin^6x)
gavmur [86]
But this isn't true... If x=\dfrac\pi2, you have

\cos^3\dfrac\pi2+3\cos\pi=0-3=-3
4\left(\cos^6\dfrac\pi2-\sin^6\dfrac\pi2\right)=4(0-1)=-4

but of course -3\neq-4.
5 0
3 years ago
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