document.write( "Question 340843: Water covers 70.7%, or about 363×106 km2, of the earth's surface. Approximate the total surface area of the earth. (Round your answer to the nearest million.) \n" ); document.write( "
Algebra.Com's Answer #244171 by CharlesG2(834)\"\" \"About 
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Water covers 70.7%, or about 363×106 km2, of the earth's surface. Approximate the total surface area of the earth. (Round your answer to the nearest million.)\r
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\n" ); document.write( "\n" ); document.write( "363 * 106 km^2 ??? ---> no, you forgot the exponent,
\n" ); document.write( "it should be 363 * 10^6 km^2 (I looked it up)
\n" ); document.write( "70.7% approx. (approximately) = 0.707 = 363 * 10^6 km^2 = 3.63 * 10^8 km^2
\n" ); document.write( "363 * 10^6 is not proper scientific notation, it should be 3.63 * 10^8\r
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\n" ); document.write( "\n" ); document.write( "0.707/(3.63 * 10^8) = 1/x
\n" ); document.write( "3.63 * 10^8 = 0.707x
\n" ); document.write( "x = 513,437,057.991513437057991513437058 non-rounded calculator result
\n" ); document.write( "x = 513 * 10^6 km^2 approx. = 513 million approx. km^2
\n" ); document.write( "x = 5.13 * 10^8 approx. km^2\r
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