document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=407377>Question 407377</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the mean radius of the earth is 6,371 km, and 70.8% of its surface is covered by water. what is the surface area of the earth covered by land? if 167 cm squared of leather is stitched together to make a baseball, what is the radius of the baseball? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #287313 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=287313\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the mean radius of the earth is 6,371 km, and 70.8% of its surface is covered by water.<BR>\n" );
document.write( " what is the surface area of the earth covered by land?<BR>\n" );
document.write( "Surface area of sphere = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2Api%2Ar%5E2 ALIGN=MIDDLE  ALT=\"4%2Api%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "S.A. = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2Api%2A6371%5E2 ALIGN=MIDDLE  ALT=\"4%2Api%2A6371%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "S.A. = 510,064,472 sq/km total<BR>\n" );
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document.write( "Percent land: 100 - 70.8 = 29.2% land<BR>\n" );
document.write( "therefore<BR>\n" );
document.write( ".292 * 510064472 = 148,938,826 sq/km is land<BR>\n" );
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document.write( "if 167 cm squared of leather is stitched together to make a baseball, what is the radius of the baseball?<BR>\n" );
document.write( "Using the Surface area of a sphere again<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2Api%2Ar%5E2 ALIGN=MIDDLE  ALT=\"4%2Api%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 167<BR>\n" );
document.write( "r^2 = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=167%2F%284%2Api%29 ALIGN=MIDDLE  ALT=\"167%2F%284%2Api%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "r^2 = 13.28943775<BR>\n" );
document.write( "r = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2813.28943775%29 ALIGN=MIDDLE  ALT=\"sqrt%2813.28943775%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "r = 3.645 inches is the radius of the baseball </SPAN>\n" );
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