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Olegator [25]
4 years ago
7

A social work researcher has decided to do a study of people who have adopted children from outside the United States. He asks a

friend, whom he knows to have recently adopted, and asks if he would consent to an interview. He interviews his friend, and then asks his friend if he could name other people who have recently adopted children from outside of the United States. His friend provides him with five names. The researcher contacts those five people, interviews them, and asks each of those people for names of other families. This sampling technique is known as:_________.1. Snowball sampling2. Availability sampling3. Sampling frame4. sampling error
Mathematics
1 answer:
garri49 [273]4 years ago
6 0

Answer:

The correct option is 1

Step-by-step explanation:

Snowball sampling is a typr of sampling technique which is used in investigating hard to reach groups. Existing subjects are asked to nominate further suubjects known to them, thereby making the sample increase like a rolling snowball

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The volume of this cube is 64 cubic units. What's the edge length?
Alona [7]
Volume of a cube = side^3

64 = s^3

So what number when multiplied by itself 3 times gives us 64?

4 !

So the side length is 4

\boxed{\bf{4 ~units}}
8 0
3 years ago
The base and sides of a container is made of wood panels. The container does not have a lid. The base and sides are rectangular.
vfiekz [6]

Answer:

Minimum surface area =70.77 cm^2

Step-by-step explanation:

We are given that

Width of container=x cm

Length of container=2x cm

Volume of container=54 cm^3

We have to find the minimum surface areas that this container will have.

Volume of container=l\times b\times h

x\times 2x\times h=54

2x^2h=54

h=\frac{54}{2x^2}=\frac{27}{x^2}

Surface area of container=2(b+l)h+lb

Because the container does not have lid

Surface area of container=S=2(2x+x)\times \frac{27}{x^2}+2x\times x

S=\frac{162}{x}+2x^2

Differentiate w.r.t x

\frac{dS}{dx}=-\frac{162}{x^2}+4x

\frac{dx^n}{dx}=nx^{n-1}

Substitute \frac{dS}{dx}=0

-\frac{162}{x^2}+4x=0

4x=\frac{162}{x^2}

x^3=\frac{162}{4}=40.5

x^3=40.5

x=(40.5)^{\frac{1}{3}}

x=3.4

Again differentiate w.r.t x

\frac{d^2S}{dx^2}=\frac{324}{x^3}+4

Substitute x=3.4

\frac{d^2S}{dx^2}=\frac{324}{(3.4)^3}+4=12.24>0

Hence, function is minimum at x=3.4

Substitute x=3.4

Then, we get

Minimum surface area =\frac{162}{(3.4)}+2(3.4)^2=70.77 cm^2

8 0
3 years ago
Triangle ABC has a height of 8 cm and an area of 42cm². <br> Calculate the length of BC.
Tcecarenko [31]

BC must be base

  • Height=8cm
  • Area=42cm^2

We know

\boxed{\sf Area_{(Triangle)}=\dfrac{1}{2} Height\times Base}

\\ \sf\longmapsto 42=\dfrac{1}{2}8BC

\\ \sf\longmapsto 4BC=42

\\ \sf\longmapsto BC=\dfrac{42}{4}

\\ \sf\longmapsto BC=10.5cm

3 0
4 years ago
Read 2 more answers
A. 167 sq. in <br>B. 248 sq. in <br>C. 340 sq. in <br>D. 375 sq. in ​
Irina-Kira [14]

Answer:

find the area of all the shapes

Base x height / 2 = area of triangle

12x10=120/2=60

there are 4 triangles so 60 x 4 = 240 square inches

length x width = area

10 x 10 = 100

240+100=340

C. is the answer

Hope this helps

Step-by-step explanation:

6 0
3 years ago
Help me w this pls I need it
icang [17]

Answer:

wuth what i cant see any picture

Step-by-step explanation:

3 0
3 years ago
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