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3 years ago

The length of a rectangular field is 24 meters this is 3meters less then twice to width find the width

Mathematics

1 answer:

Sever21 [200]3 years ago

5 0

Answer:

13.5 meters

Step-by-step explanation:

lets take width as w

l=24

and length is 3 meters less than twice the width

l+3=2w

24+3=2w

27=2w

divide both sides by "2"

27/2=13.5

13.5=w

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Answer:

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Step-by-step explanation:

Equation for an amount of a decaying substance:

The equation for the amount of a substance that decay exponentially has the following format:

$A(t) = A(0)e^{-kt}$

In which k is the decay rate, as a decimal.

k-value of 0.1392.

This means that:

$A(t) = A(0)e^{-0.1392t}$

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This is t for which $A(t) = 0.5A(0)$ . So

$A(t) = A(0)e^{-0.1392t}$

$0.5A(0) = A(0)e^{-0.1392t}$

$e^{-0.1392t} = 0.5$

$\ln{e^{-0.1392t}} = \ln{0.5}$

$-0.1392t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.1392}$

$t = 4.98$

The substance half-life is of 4.98 days.

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