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Viktor [21]
3 years ago
11

Students at a middle school are divided into 6th, 7th, and 8th grades. A random sample of 15 students from each grade is chosen.

Mathematics
1 answer:
Julli [10]3 years ago
4 0

Answer:

B. Stratified random sample is the correct answer

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Answer:g=-7

Step-by-step explanation:

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3 years ago
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A househusband is cooking beef stew for his family in a pan that is (a) uncovered, (b) covered with a light lid, and (c) covered
raketka [301]

Answer:

Cooking will be shortest when the househusband covers the beef stew with the heavy lid.

Step-by-step explanation:

The explanation for this is that water boils at 100°C at normal atmospheric pressure & it remains at that temperature until all the water evaporates as steam; the temperature can then go higher in steam form.

So, if he leaves the pan uncovered the pressure above the beef stew will be the atmospheric pressure and the temperature of the stew will not pass the 100°C mark and the food cooks at 100°C.

If he places a light lid on top, the pressure will build up & the temperature at which water remains liquid is a bit higher, but eventually the steam will push the lid to escape thereby releasing pressure & reducing the temperature.

If he puts a heavy lid on the pan the pressure can build up the highest and the temperature of the water in the stew will stay the highest ensuring the fastest cooking.

Basically, the heavier the lid, greater the pressure in the pan. As the pressure gets greater, the saturation temperature at which water starts boiling will be higher. And higher boiling temperatures mean shorter cooking times.

8 0
3 years ago
1 Point
Inessa [10]

Answer: Option B

y=5x-11

Step-by-step explanation:

The equation of a line has the following form:

y=mx+b

Where m is the slope of the line and b is the intersection with the y axis

So the slope of the line y = 5x - 4 is m = 5

By definition if two lines are parallel then they will have the same slope. Therefore the line parallel to y = 5x - 4 will have the same slope:

y=5x+b

To find b we substitute point (3, 4) in the equation and solve for b

4=5(3)+b

4=15+b

b=4-15\\b=-11

Then the equation is:

y=5x-11

6 0
4 years ago
A rectangular prism has a length of 10 inches, a width of 6 inches, and a heights of 5 inches. What’s its volume?
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Volume = 10×6×5 = 300 inches3

Step-by-step explanation:

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c

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3 years ago
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