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Vika [28.1K]
2 years ago
15

the half life of radium-226 is 1600 years. after how many half-lives would 25% of the radium-226 remain?

SAT
1 answer:
docker41 [41]2 years ago
3 0

Answer:

400

Explanation:

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Around half of the electricity used in the United States is powered by burning coal. The United States is a developed country wi
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The two options would be to reduce the demand for energy and or use renewable sources of energy. Options C and D are correct.

<h3>How to reduce carbon emission</h3>

The burning of fossil fuels such as coal and crude oil-derived fuels generates a large amount of emissions.

In order to cut down on the emission, the demand for energy needs to be lowered by all means. In addition, instead of using fossil fuels, renewable sources of energy can be used.

Greenhouse gases such as carbon dioxide, oxides of sulfur, and water vapor are produced largely as by-products of burning fossil fuels. These gases form a layer in the atmosphere and trap reflected solar radiation.

By doing so, the increase the average annual temperature of the planet (global warming). The warming of the planet has several negative effects on the climate and the ecosystems as a whole.

Renewable sources of energy, on the other hand, have very little to no greenhouse gas emissions.

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8 0
2 years ago
Consider the table below and answer the probability question. Write your answer as a percentage rounded to 1 decimal.
N76 [4]

Answer:

P(Joe) = 0.3

P(Joe\ \&\ North\ Side) = 0.2

Explanation:

Solving (a): P(Joe)

To get this probability, we simply add up the items in the column named Joe.

These items are:

Joe: 34 and 70

And the total is:

Joe = 34 + 70

Joe = 104

The overall population of the system is:

Total = 409

So:

P(Joe) = \frac{Joe}{Total}

P(Joe) = \frac{104}{409}

P(Joe) = 0.3

Solving (a): P(Joe and North Side)

To get this probability, we simply get the intersecting element of Joe column and North Side row.

From the table, the intersecting element is:

Joe and North Side: 70

The overall population of the system is:

Total = 409

P(Joe\ \&\ North\ Side) = \frac{Joe\ \&\ North\ Side}{Total}

P(Joe\ \&\ North\ Side) = \frac{70}{409}

P(Joe\ \&\ North\ Side) = 0.2

7 0
3 years ago
The application of science for practical uses. *
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Answer:

the answer is scientific method

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3 years ago
note: enter your answer and show all the steps that you use to solve this problem in the space provided. a cone with a diameter
ankoles [38]

Answer: 548.96

Explanation: first find the circumference of the circle in the cone: 8*8*3.14 = 200.96

next find the triangle's area: 8 * 7/2 = 348

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8 0
2 years ago
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