document.write( "Question 1065943: The height of waves in a storm depends on the speed of the wind. Assuming the wind has no obstructions for a long distance, suppose the maximum wave height H for a wind speed x can be approximated by H = 0.05x^2+2x−15, where H is in feet and x is in knots (nautical miles per hour). For what wind speed would the maximum wave height be 10 ft? \n" ); document.write( "

Algebra.Com's Answer #681122 by Boreal(15235) $\"\"$ $\"About$

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10=0.05 x^2+2x-15
\n" ); document.write( "Multiply by 20 to remove the decimal point.
\n" ); document.write( "200=x^2+40x-300
\n" ); document.write( "x^2+40x-500=0
\n" ); document.write( "(x+50)(x-10)=0
\n" ); document.write( "x=10 knots.
\n" ); document.write( "10=100(0.05)+10(2)-15=10 \n" ); document.write( "

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