Question 981483: Of this electric energy, 260.2 billion kWh were produced by hydroelectric
sources (think water over dams – like Snoqualmie Falls) in 2010.
a) Write this number in correct scientific notation in terms of kWh.
b) What percent of the total US electric energy did hydroelectric sources
account for in 2010? (Round to the nearest 10th of a percent.)
3. Additionally, 94.7 billion kWh were produced by wind power sources.
a) Write this number in correct scientific notation in terms of kWh.
b) What percent of the total US electric energy did wind power sources
account for in 2010? (Round to the nearest 10th of a percent.)
What percent of the total US electric energy did hydro and wind power
sources account for in 2010 combined?
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.
a) What adjustment could be made to either 2a or 3a to allow you to add your values in scientific notation?
(Describe in words and demonstrate. Hint: think about “like terms”)
b) Find the total combined amount of hydro and wind energy produced in 2010.
(Use your idea from part a) and write your answer in correct scientific
notation in terms of kWh.)
On average, an American household used 11,698 kWh in 2010.
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.)
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.)
c) If done correctly, your answer to 5b) doesn’t match your answer to 3c), though it seems it should. Why is this?
Answer by solver91311(24713)   (Show Source):
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John
My calculator said it, I believe it, that settles it
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