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3 years ago

Which expression calculates the speed in meters per second of an object that travels a distance of 40 m every 10 s?

Mathematics

1 answer:

RideAnS [48]3 years ago

3 0

Speed = distance/time

So speed = 40/10

= 4m/s

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Kenyon ran for 8 miles each week while training. Here is his record of the number of miles he ran.

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Let x be the miles Kenyon ran on tuesday

Let y be the miles Kenyon ran on thursday

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Now we have x + y = 5.2 as equation 1 and -x + y = 0.4 as equation 2

Using equation 1,

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Substitute this equation into equation 2.

$- (5.2 - y) + y = 0.4 \\ - 5.2 + y + y = 0.4 \\ - 5.2 + 2y = 0.4 \\ 2y = 0.4 + 5.2 \\ 2y = 5.6 \\ y = 5.6 \div 2 \\ = 2.8mi$

Substitute y = 2.8 into equation 1.

$x + 2.8 = 5.2 \\ x = 5.2 - 2.8 \\ = 2.4mi$

Therefore Kenyon ran 2.4 miles on tuesday, and ran 2.8 miles on thursday.

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