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const2013 [10]
4 years ago
14

340 pages 20% decrease

Mathematics
2 answers:
I am Lyosha [343]4 years ago
7 0
Multiply 340 by 20%
first change 20% into a decimal which is 0.2
340*0.2 = 68
so it decreased by 68. 
VLD [36.1K]4 years ago
6 0
272, 10%= 34
34+34=68
340-68+272

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\huge\boxed{y=\dfrac{2}{3}x-\dfrac{4\sqrt{13}}{3}\ \vee\ y=\dfrac{2}{3}x+\dfrac{4\sqrt{13}}{3}}

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substitute:

y=\dfrac{2}{3}x+b

The formula of a distance between a point and a line:

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(x_0,\ y_0)

Distance:

d=\dfrac{|Ax_0+By_0+C|}{\sqrt{A^2+b^2}}

Convert the equation:

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4=\dfrac{|3b|}{\sqrt{13}}\qquad|    |<em>multiply both sides by \sqrt{13}</em>

4\sqrt{13}=|3b|\iff3b=-4\sqrt{13}\ \vee\ 3b=4\sqrt{13}   |<em>divide both  sides by 3</em>

b=-\dfrac{4\sqrt{13}}{3}\ \vee\ b=\dfrac{4\sqrt{13}}{3}

Finally:

y=\dfrac{2}{3}x-\dfrac{4\sqrt{13}}{3}\ \vee\ y=\dfrac{4\sqrt{13}}{3}

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3 years ago
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