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omeli [17]
3 years ago
14

The troposphere is the first layer above the surface and contains half of the Earth's atmosphere. Weather occurs in this layer.

2) Many jet aircrafts fly in the stratosphere because it is very stable. Also, the ozone layer absorbs harmful rays from the Sun.
SAT
1 answer:
Sliva [168]3 years ago
7 0

Answer:

atmosphere is divided into five layers. It is thickest near the surface and thins out with height until it eventually merges with space.

The troposphere is the first layer above the surface and contains half of the Earth's atmosphere. Weather occurs in this layer.

Many jet aircrafts fly in the stratosphere because it is very stable. Also, the ozone layer absorbs harmful rays from the Sun.

Meteors or rock fragments burn up in the mesosphere.

The thermosphere is a layer with auroras. It is also where the space shuttle orbits.

The atmosphere merges into space in the extremely thin exosphere. This is the upper limit of our atmosphere.

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3 0
2 years ago
In a theater, there are 15 chairs in the first row, each row has 3 more chairs than the previous row, and there are 15 rows. how
Nimfa-mama [501]

The 1st row has 15 chairs.

The 2nd row has 15 + 3 = 18 chairs.

The 3rd row has 18 + 3 = 15 + 2•3 = 21 chairs.

The 4th row has 21 + 3 = 15 + 3•3 = 24 chairs.

The pattern continues, so that the n-th row has 15 + (n - 1)•3 = 3n + 12 chairs.

If there are 15 rows, then the total number of chairs is

\displaystyle \sum_{n=1}^{15} (3n + 12) = 3 \sum_{n=1}^{15} n + 12 \sum_{n=1}^{15} 1 = 3\cdot\frac{15\cdot16}2 + 12\cdot15 = \boxed{540}

where we use the formulas

\displaystyle \sum_{n=1}^N 1 = N

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5 0
3 years ago
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Explanation:

Hope this helps! :)

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