document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=981619>Question 981619</A>: <I><SPAN STYLE=\"word-break: break-all;\"> this question is long but all of them have some type of connection. I have answer to the question that I could answer. I am asking for help. \r<BR>\n" );
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document.write( "1. According to the U.S. Energy Information Administration (www.eia.gov) the United States consumed 4.151 trillion kWh (kilowatt-hours) of electric energy in 2010. Write this number in correct scientific notation in terms of kWh.<BR>\n" );
document.write( "My answer: 4.151 X 10^12<BR>\n" );
document.write( "2. Of this electric energy, 260.2 billion kWh were produced by hydroelectric<BR>\n" );
document.write( "sources (think water over dams – like Snoqualmie Falls) in 2010.\r<BR>\n" );
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document.write( "a) Write this number in correct scientific notation in terms of kWh.<BR>\n" );
document.write( "My answer:2.602 x 10^11\r<BR>\n" );
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document.write( "b) What percent of the total US electric energy did hydroelectric sources<BR>\n" );
document.write( "account for in 2010? (Round to the nearest 10th of a percent.)\r<BR>\n" );
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document.write( "My answer:6.3%\r<BR>\n" );
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document.write( "3. Additionally, 94.7 billion kWh were produced by wind power sources.<BR>\n" );
document.write( "a) Write this number in correct scientific notation in terms of kWh.\r<BR>\n" );
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document.write( "My answer:9.47 x 10^10\r<BR>\n" );
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document.write( "b) What percent of the total US electric energy did wind power sources<BR>\n" );
document.write( "account for in 2010? (Round to the nearest 10th of a percent.)\r<BR>\n" );
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document.write( "My answer:2.3%\r<BR>\n" );
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document.write( "c) What percent of the total US electric energy did hydro and wind power<BR>\n" );
document.write( "sources account for in 2010 combined?\r<BR>\n" );
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document.write( "My answer: 8.6%\r<BR>\n" );
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document.write( "4. Scientific Notation is a good tool for multiplying and dividing, but not as good of a tool for adding and subtracting. If done correctly, your answers to #2a and 3a cannot easily be added.<BR>\n" );
document.write( "a) What adjustment could be made to either 2a or 3a to allow you to add your values in scientific notation?<BR>\n" );
document.write( "(Describe in words and demonstrate. Hint: think about “like terms”)<BR>\n" );
document.write( "I am not sure what adjustments would be needed \r<BR>\n" );
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document.write( "b) Find the total combined amount of hydro and wind energy produced in 2010.<BR>\n" );
document.write( "(Use your idea from part a) and write your answer in correct scientific notation in terms of kWh.)\r<BR>\n" );
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document.write( "I am not sure on how to set this problem up.\r<BR>\n" );
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document.write( "5. On average, an American household used 11,698 kWh in 2010.<BR>\n" );
document.write( "a) How many American households could have been powered completely on hydro and wind power in 2010? (You may round to the nearest 10th of a million.)\r<BR>\n" );
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document.write( "I am not sure on how to set this problem up.\r<BR>\n" );
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document.write( "b) If there were 116.7 million households in 2010, your answer to part a) is what percentage of all American households? (Round to the nearest 10th of a percent.)\r<BR>\n" );
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document.write( "I am not sure on how to set this problem up.\r<BR>\n" );
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document.write( "c) If done correctly, your answer to 5b) doesn’t match your answer to 3c), though it seems it should. Why is this? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #602591 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=602591\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "4. Scientific Notation is a good tool for multiplying and dividing, but not as good of a tool for adding and subtracting. If done correctly, your answers to #2a and 3a cannot easily be added.<BR>\n" );
document.write( "a) What adjustment could be made to either 2a or 3a to allow you to add your values in scientific notation?<BR>\n" );
document.write( "(Describe in words and demonstrate. Hint: think about “like terms”)<BR>\n" );
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document.write( "2a) 2.602 x 10^11 <BR>\n" );
document.write( "3a) 9.47 x 10^10<BR>\n" );
document.write( "To be added, numbers must be of the same degree (the exponent of 10 must be the same) Convert 2.602 x 10^11 to 26.02 x 10^10, and:<BR>\n" );
document.write( "(26.02 x 10^10)+(9.47 x 10^10)=(26.02+9.47)x10^10=35.49 x 10^10=3.59 x 10^11<BR>\n" );
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document.write( "b) Find the total combined amount of hydro and wind energy produced in 2010.<BR>\n" );
document.write( "(Use your idea from part a) and write your answer in correct scientific notation in terms of kWh.)<BR>\n" );
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document.write( "This answer is given as example in part a above.<BR>\n" );
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document.write( "5. On average, an American household used 11,698 kWh in 2010.<BR>\n" );
document.write( "a) How many American households could have been powered completely on hydro and wind power in 2010? (You may round to the nearest 10th of a million.)<BR>\n" );
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document.write( "Total kWh from hydro and wind=answer to 3b=3.59 x 10^11 kWh<BR>\n" );
document.write( "divided by kWh/household (given)=1.1698 x 10^4 kWh:<BR>\n" );
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document.write( "Number of households=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283.59%2A10%5E11kWh%29%2F%281.17%2A10%5E4kWh%29=%283.59%2F1.17%29%2A10%5E7 ALIGN=MIDDLE  ALT=\"%283.59%2A10%5E11kWh%29%2F%281.17%2A10%5E4kWh%29=%283.59%2F1.17%29%2A10%5E7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "b) If there were 116.7 million households in 2010, your answer to part a) is what percentage of all American households? (Round to the nearest 10th of a percent.)<BR>\n" );
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document.write( "((Answer to part a)/116.7 million)(100%)=percentage<BR>\n" );
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document.write( "c) If done correctly, your answer to 5b) doesn’t match your answer to 3c), though it seems it should. Why is this?<BR>\n" );
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document.write( "Households do not use 100% of power produced </SPAN>\n" );
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