document.write( "Question 1186141: A long straight river, 100 meters wide, is flowing at 1 meter per sec. A pollutant is entering the river at a consistent rate from one of its banks. As the pollutant disperses in the water, it forms a plume that is modeled by the equation y= the sqare root of x.
\n" ); document.write( "How wide is the plume at 121 meters?
\n" ); document.write( "How wide is it at 400 meters?
\n" ); document.write( "How far down from the river source does the pollutant plume reach halfway across the river?
\n" ); document.write( "How far down the river does the plume reach the other side? \n" ); document.write( "

Algebra.Com's Answer #817010 by ikleyn(52866) $\"\"$ $\"About$

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document.write( "(a)  How wide is the plume at 121 meters?\r\n" );
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document.write( "     Substitute the value of 121 m into the formula instead of x and calculate y.\r\n" );
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document.write( "(b)  How wide is it at 400 meters?\r\n" );
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document.write( "     Substitute the value of 400 m into the formula instead of x and calculate y.\r\n" );
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document.write( "(c)  How far down from the river source does the pollutant plume reach halfway across the river?\r\n" );
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document.write( "     Should be  50 = sqrt(x).\r\n" );
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document.write( "     Square both sides and get the ANSWER:  x = 2500 meters = 2.5 kilometers.\r\n" );
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document.write( "(d)  How far down the river does the plume reach the other side?\r\n" );
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document.write( "     Should be  100 = sqrt(x).\r\n" );
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document.write( "     Square both sides and get the ANSWER:  x = 10,000 meters = 10 kilometers.\r\n" );
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