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OleMash [197]
3 years ago
5

Light travels about 180 million kilometers in 10 minutes. How far does it travel in one minute? How far does it travel in one se

cond?
Mathematics
2 answers:
astraxan [27]3 years ago
8 0

Answer:

18 million kilometers in one min. and 0.3 million kilometers in one second

Step-by-step explanation:

so the one min. is easy because all you have to do is take 180 and divide it by 10 and you get 18 million kilometers in one min. and then you would take 18 and divide it by 60 and you would get 0.3 million kilometers in one second

aliya0001 [1]3 years ago
7 0

Answer:

The light travels distance in 1 minute=18 million kilometers

The light travels distance in 1 second=0.3 million kilometers

Step-by-step explanation:

We are given that

Light travels total distance in 10 minutes=180 million kilometers

We have to find the distance travels by light in 1 minute and in 1 seconds.

By unitary method

Distance travel by light in 1 min=\frac{180}{10}million kilometers=18 million kilometers

Distance travel by light in 1 min=18 million kilometers

We know that 1 minute=60 seconds

In 60 seconds, light travels distance =18 million kilometers

In 1 second, light travels distance =\frac{18}{60}=0.3 million kilometers

Hence, the light travels distance in 1 minute=18 million kilometers

The light travels distance in 1 second=0.3 million kilometers

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8 0
3 years ago
Work out the percentage change to 2 decimal places when a price of £57.99 is decreased to £49.99.
IRISSAK [1]

Answer:

Percentage change in price = 13.80%

Step-by-step explanation:

Given that:

Original price = £57.99

Decreased price = £49.99

Difference = Original price - Decreased price

Difference = 57.99 - 49.99

Difference = £8.00

Percent change = \frac{Difference}{Original\ price}100

Percent change = \frac{8.00}{57.99}*100

Percent change in price = 13.80%

Hence,

Percentage change = 13.80%

5 0
3 years ago
If 55% of a number is 132 and 25% of the same number is 60, find 80% of that number.
UNO [17]

Answer:

  192

Step-by-step explanation:

It is always wise to look carefully at the question to see what information is given, and what information you are asked for. You are given two different fractions of the same number, and you want the value of a third fraction of that number. That third fraction is the sum of the other two.

__

The value of 80% of the number will be the sum of 55% and 25% of the number.

  n×80% = n×55% +n×25%

  n×80% = 132 +60

  n×80% = 192

80% of the number is 192.

_____

<em>Additional comment</em>

Your first clue that there may be something special about this problem lies in the fact that one fraction of a number is all you need in order to find any other fraction. Here, we're given two fractions (55% and 25%), so that is more information than we need. Why? Because it simplifies the problem to one of addition. No proportions need to be solved.

__

If you were interested, you could determine 100% of the number to be ...

  132/n = 55/100   ⇒   n = 132(100/55) = 240

or

  60/n = 25/100   ⇒   n = 60(100/25) = 240

Then ...

  0.80n = 0.80(240) = 192 . . . . 80% of the number

Or, you could write proportions for the 80% value:

  80%/55% = n/132   ⇒   n = 132(80/55) = 192 . . . . 80% of the number

  80%/25% = n/60   ⇒   n = 60(80/25) = 192 . . . . 80% of the number

__

"Look carefully" includes thinking about the ways the <em>givens</em> and the <em>finds</em> are related.

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2 years ago
a construction crew has just finished building a road. the crew worked for 6 days. if they built 3 3/4 kilometers of road each d
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<span>they built 2.22 km per day I think</span>
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3 years ago
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the answer is A : m=-1
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