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crimeas [40]
3 years ago
5

The level of water in a dam was decreasing by 20% each day. If the level of water was 1500cm,what was the level after two days?

Mathematics
2 answers:
Harlamova29_29 [7]3 years ago
7 0

Answer:

960 cm.

Step-by-step explanation:

For the first day:

Subtract the primary level of water by the 20% of it. 20% of 1500 is:

0.2*1500=300 (Convert the percent to decimal)

Then subtract 1500 to 300. That would become 1200cm for the first day.

For the second day:

Subtract the level of water from the first day by 20% of it. 20% of 1200 is:

0.2*1200= 240

Then subtract 1200 to 240. That would become 960 for the second day.

The level of the water after 2 days is 960 cm.

nirvana33 [79]3 years ago
5 0

Answer:900

Step-by-step explanation:

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200 σ j=1 2j( j 3) describe the steps to evaluate the summation. what is the sum?
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<h3>What does summation mean in math?</h3>

The outcome of adding numbers or quantities mathematically is a summation, often known as a sum. A summation always has an even number of terms in it. There may be just two terms, or there may be 100, 1000, or even a million. Some summations include an infinite number of terms.

<h3>Briefing:</h3>

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<h3>Calculation according to the statement:</h3>

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\sum_{j=1}^{200} 2 j^{2}+6 j=2 \sum_{j=1}^{200} j^{2}+6 \sum_{j=1}^{200} j

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Add the results of the summations.

5373400 + 120600

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The sum of the equation is  = 5494000.

To know more about  summations visit:

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