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3 years ago

Find the sum. 19+(-19)

Mathematics

1 answer:

MrRa [10]3 years ago

6 0

19+(-19)=0

Step-by-step explanation:

So first lets simplify this. We can use the method keep,change, change to do this. Keep the value of positive 19. Then change the + sign to - and the - sign to plus which gets us

19-(+19).

We can remove the +since we know its positive leaving 19-19 which is 0

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Whitepunk [10]

Given

An enclose an area of 300 square feet with fence. If the area is rectangular, what is the least amount of fence

Solution

Then perimeter

$Perimeter=2(x+\frac{300}{x})$ $\begin{gathered} \frac{dp}{dx}=2(1-\frac{300}{x^2})=0 \\ \\ 1-\frac{300}{x^2}=0 \\ \\ 1=\frac{300}{x^2} \\ \\ x^2=300 \\ x=\sqrt{300} \end{gathered}$

Now substitute x into the perimeter

$\begin{gathered} Perimeter=2(\sqrt{300}+\frac{300}{\sqrt{300}}) \\ perimeter\text{ =amount} \\ Amount=2(\sqrt{300}+\frac{300}{\sqrt{300}}) \\ Amount=40\sqrt{3} \\ Amount=69.28203 \end{gathered}$

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