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4 years ago

in a fireplace, about 3/4 of an 18-inch log will burn in 1/3 of an hour. How many hours will it take to burn 2 1/2 logs?

1 answer:

3 0

3/4 =1/3 hour
how long to burn 2 and 1/2

3/4=1/3hour
1/4=1/9 hour
4/4=1=4/9hour
1/2=2/4
1/2=2/9hour

2 and 1/2=1+1+1/2=4/9+4/9+2/9=10/9=9/9+1/9=1+1/9=1 and 1/9

answer is C. 1 and 1/9 hour

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Answer:

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Step-by-step explanation:

Given

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See comment for missing part of the question

Required

Complete the expression to determine the dimension of a rectangle

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$x(x-3) =10$

Open bracket

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$x^2 -3x - 10 =0$

Expand

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Factorize

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Factor out x + 2

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$x = 5$ or $x = -2$

The value of x cannot be negative

So:

$x = 5$

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$Length = x$

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