document.write( "Question 815556: The grade of a highway up a hill is 20%. How much change in a horizontal distance is there if the vertical height of the hill is 80 feet?
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Algebra.Com's Answer #491037 by TimothyLamb(4379)\"\" \"About 
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g = 100 * rise / run
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\n" ); document.write( "g = 100 * rise / run
\n" ); document.write( "20 = 100 * 80 / run
\n" ); document.write( "20 = 8000 / run
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\n" ); document.write( "run = 8000 / 20
\n" ); document.write( "run = 400 ft
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