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n200080 [17]
3 years ago
6

A university has ten dormitories for students. All of the dormitories have students of similar ages and offer the same convenien

ces. The director of housing wants to gather data by using a questionnaire with a sample of 100 students who live in the dormitories. Which of the following is the most statistically reliable method to gather that data? A,Take the list of all students who live in all ten dormitories. Randomly select 10 students from each of the dormitories to complete the questionnaire.
B.Send the questionnaire to every student who lives in a dormitory. Offer prizes to the first 10 students from each dormitory that completes the questionnaire.
C. Have volunteers walk around campus and randomly interview students. Give the questionnaires to the first 100 students who say they live in a dormitory.

D. Select one of the ten dormitories at random. Then randomly select 100 stu
dents from the list of all students who live in that dormitory to complete the questionnaire.
Mathematics
1 answer:
lina2011 [118]3 years ago
4 0

Answer:

a is correct

Step-by-step explanation:

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In the expression below, a is an integer. 12^3+ax-20 if 3x+4 is a factor of the expession above, what is the value of a
SVEN [57.7K]

Our function is:

f(x)=12^3+ax-20

Now, if 3x+4 is a factor of f(x) then x=\frac{-4}{3} must satisfy the equation:

So, f(\frac{-4}{3} )=0

Putting x=\frac{-4}{3}

We get,

f(\frac{-4}{3} )=12^3+a(\frac{-4}{3} )-20=0

12^3+\frac{-4}{3} a-20=0

\frac{-4}{3} a=20-12^3=20-1708

a=-1708 \times \frac{-3}{4} =1281

So, the value of 'a' for the given expression is 1281.

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3 years ago
The graph show the grades that students received on a test. What percent of the students received a grade of A ?
Tema [17]

Answer:

what graph..show the graph

Step-by-step explanation:

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3 years ago
What is the distance between (-5, -8) and (-1, -16)
yulyashka [42]

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Step-by-step explanation:

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4 0
3 years ago
How to write 12/4 as a whole number
My name is Ann [436]

Answer:

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2 years ago
Read 2 more answers
Could someone answer this pls thank u
loris [4]

Given:

The area model.

The area of the shape is 82 square units.

To find:

The correct equation for the given situation.

Solution:

We know that, area of a rectangle is

Area=Length \times Width

The figure is divided into 3 rectangles. Using this formula, the area of each rectangle is

A_1=(x)\times (3x)=3x^2

A_2=(x)\times (4)=4x

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Now, the total area is equation to 82 square units.

A_1+A_2+A_3=82

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Since the required equation is 3x^2+13x=82, therefore, the correct option is C.

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3 years ago
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