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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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Flying against the wind, a jet travels 2190 miles in 3 hours. Flying with the wind, the same jet travels 9520 miles in 8 hours.
dezoksy [38]

Answer:

Velocity of jet in still air is 970 miles per hour and velocity of wind is 210 miles per hour.

Step-by-step explanation:

Jet's velocity against wind is

3040/4 = 760 miles per hour and flying with wind it is

8260/7 = 1180 miles per hour.

Let the velocity of jet in still air be x miles per hour and velocity of wind be y miles per hour.

As such its velocity against wind is x − y and with wind is x + y and therefore

x − y = 760 and x + y = 1180

Adding the two 2 x = 1940 and x = 970 and y = 1180 − 970 = 210

Hence velocity of jet in still air is 970 miles per hour and velocity of wind is

210 miles per hour.

Actual Answer:

https://socratic.org/questions/flying-against-the-wind-a-jet-travels-3040-miles-in-4-hours-flying-with-the-wind

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3 years ago
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kirill [66]

The answer is 58 degrees.

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The result of 1/12×0,30 is<br>please answer​
Archy [21]

Answer:

0.025

Step-by-step explanation:

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3 years ago
If 6=2x+4y, what is the value of x+2y?
Tamiku [17]

Answer:

3

Step-by-step explanation:

Take 2 as a common then divide by 2

6÷2 =3

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I need helps<br> can you simply this please :)
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64-18+2

Hope this helps...

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