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VikaD [51]
3 years ago
15

{5x=7y {x+7y=21 pls help i dnt understand this...

Mathematics
1 answer:
Alinara [238K]3 years ago
4 0

Answer:

x = 7/2 y = 5/2

Step-by-step explanation:

You can either use the elimiation or adding and subtracting method to get the variables for both x & y.

Once you solved for one variable, plug in the variable you just solved back into the original equation to find the other variable.

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A car travels at a constant speed of 45 km per hour for 5 min each wheel has a radius of 25 centimeters calculate the number of
Arisa [49]

Answer:

477.47 revolutions

Step-by-step explanation:

From the information given:

The formula for calculating the circumference = 2π r

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= 50π cm

The distance traveled in 5 minutes is as follows:

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The speed = 45 km/ hour

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1 hour = 45 km

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To cm;

0.75 km = (0.75 × 1000) m = 750 m

750 m = 750 × 100 = 75,000 cm

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The number of revolution in 5 minutes sInce 1 revolution =  50π cm is:

=  75,000 cm/ 50π cm

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6 0
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