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Natasha2012 [34]
3 years ago
8

A school wants to attract more students to its media center. The media specialist has been asked to conduct a survey to determin

e which new media items students would like the school to purchase for the media center. Which method should the media specialist use to conduct the survey?
A) Survey the first 25 students in the media center during lunch.

B) Survey a random sample of all students based on student registration.

C) Survey any student who has checked out library materials in the last month.

D) Survey the teachers and staff members.
Mathematics
1 answer:
aliina [53]3 years ago
6 0
I would say C or B but I may be wrong
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Answer:

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Step-by-step explanation:

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Given x : y: z = 5:1:3 and z - y = 28. find the value of x + y​
Vera_Pavlovna [14]

Answer:

x + y = 84

Step-by-step explanation:

Given

x : y : z = 5 : 1 : 3, then

\frac{x}{y} = 5 ( multiply both sides by y )

x = 5y ←

and \frac{y}{z} = \frac{1}{3} ( cross- multiply )

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Substitute z = 3y into z - y = 28

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y = 14 ← ←

Substitute y = 14 into x = 5y

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Substitute y = 14 into z - y = 28

z - 14 = 28 ( add 14 to both sides )

z = 42 ← ←

Thus x = 70, y = 14 and z = 42

Hence x + y = 70 + 14 = 84

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3 years ago
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