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Yakvenalex [24]
2 years ago
15

Plss answer it correctly...I need asap​

Mathematics
1 answer:
lina2011 [118]2 years ago
4 0

Answer:

sorry I cannot understand that

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Assume that advanced students average 93% on an achievement test and regular students averaged 75%. If 100 advanced students and
Lemur [1.5K]
Average (mean) = (sum of all the data) / (# of data)

sum of all the data = (average)(# of data)

Thus for 100 students with an average of 93,
sum of all data = (93)(100) = 9300

and for 300 students with an average of 75,
sum of all data = (75)(300) = 22500

Therefore you would expect the overall average to be
(9300 + 22500) / (100 + 300) = 79.5 %

Now if there are x # of advanced students and y # of regular students, then

x + y = 90 (total # of students) and 93x + 75y = 87(x + y) (overall average)

The second equation can be simplified to x - 2y = 0

Subtracting the two equations yields

x = 60 and y = 90

Therefore you would need 60 advanced and 30 regular students.
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The model below represents the equation shown. What is the value of x?
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Answer:

Step-by-step explanation:

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Please help quickly
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Step-by-step explanation:

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You know the length and width of a scale model. what additional information do you need to find the scale of the model?
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What the model is scaled by
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Round <br> 1,066<br> to the nearest thousand.
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