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3 years ago

The opposite of 7 is 1/7

2 answers:

7 0

This depends on your definition of opposite, if you define opposite as the inverse of something then indeed 7 is the opposite of 1/7 however you could also define opposite as the negative of something, hence the opposite of 7 is -7, the word opposite is not well defined when it comes to mathematics so refrain from using it.

geniusboy [140]3 years ago

4 0

That is false the opposite of 7 is -7

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levacccp [35]

Answer: 1 hour 20 minutes

Step-by-step explanation:

Given : The old machine could shred a truckload of paper in 4 hours.

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Rate of work done by new machine = $\dfrac{1}{2}$

Let 't' be the time taken by both of them working together , then we have the following equation:-

$\dfrac{1}{t}=\dfrac{1}{4}+\dfrac{1}{2}\\\\\Rightarrow\dfrac{1}{t}=\dfrac{1+2}{4}\\\\\Rightarrow\dfrac{1}{t}=\dfrac{3}{4}\\\\\Rightarrow t=\dfrac{4}{3}=1\dfrac{1}{3}\ \text{ hours}$

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