Tutors Answer Your Questions about Exponents (FREE)
Question 978173: Learning Theory.
In a psychology experiment, students were given a nine-digit number to memorize. The percent P of students who remembered the number t minutes after it was read to them can be given by P= 90-3t^2/3. What percent of the students remembered the number after 1 hour?
Click here to see answer by KMST(5328)   |
Question 979352: Okay I'm sorry for resubmitting this same question, but where did you pull  from Mr. Alan3354? Just seeing the numbers doesn't make much sense to me, does anyone mind helping?
Original Question: Simplify the exponential expression:
Click here to see answer by MathLover1(20849)  |
Question 981158: Hello tutors: base 8 ^ 5/3
= 2^(4 x/2).....I got the first half by doing this...base (2^3)^5/3 and then base 2^5... the second part I could not figure that out...can I have a step by step on the second part of this equation and final answer...thanks tutors.
Click here to see answer by Edwin McCravy(20054)  |
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?
Click here to see answer by solver91311(24713)  |
Question 981575: 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.
My answer: 2.6 X 10^11
b) What percent of the total US electric energy did hydroelectric sources
account for in 2010? (Round to the nearest 10th of a percent.)
I can not figure out how to get the percentage.
Click here to see answer by macston(5194)  |
Question 981583: I know this is a long question. I have done the best that I could do. I am having trouble figuring out the percentages. All of the question have something in common with each other.
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.
My answer:5.151 X 10^12
2. 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.
my answer:2.6 X 10^11
b) What percent of the total US electric energy did hydroelectric sources
account for in 2010? (Round to the nearest 10th of a percent.)
My answer: 62%
3. Additionally, 94.7 billion kWh were produced by wind power sources.
a) Write this number in correct scientific notation in terms of kWh.
My answer: 9.47 X 10^10
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.)
I can not figure out the percentage.
c) What percent of the total US electric energy did hydro and wind power
sources account for in 2010 combined?
I can not figure out the percentage.
Click here to see answer by solver91311(24713) |
Question 981583: I know this is a long question. I have done the best that I could do. I am having trouble figuring out the percentages. All of the question have something in common with each other.
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.
My answer:5.151 X 10^12
2. 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.
my answer:2.6 X 10^11
b) What percent of the total US electric energy did hydroelectric sources
account for in 2010? (Round to the nearest 10th of a percent.)
My answer: 62%
3. Additionally, 94.7 billion kWh were produced by wind power sources.
a) Write this number in correct scientific notation in terms of kWh.
My answer: 9.47 X 10^10
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.)
I can not figure out the percentage.
c) What percent of the total US electric energy did hydro and wind power
sources account for in 2010 combined?
I can not figure out the percentage.
Click here to see answer by Boreal(15235)  |
Question 981619: 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.
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.
My answer: 4.151 X 10^12
2. 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.
My answer:2.602 x 10^11
b) What percent of the total US electric energy did hydroelectric sources
account for in 2010? (Round to the nearest 10th of a percent.)
My answer:6.3%
3. Additionally, 94.7 billion kWh were produced by wind power sources.
a) Write this number in correct scientific notation in terms of kWh.
My answer:9.47 x 10^10
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.)
My answer:2.3%
c) What percent of the total US electric energy did hydro and wind power
sources account for in 2010 combined?
My answer: 8.6%
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”)
I am not sure what adjustments would be needed
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.)
I am not sure on how to set this problem up.
5. 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.)
I am not sure on how to set this problem up.
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.)
I am not sure on how to set this problem up.
c) If done correctly, your answer to 5b) doesn’t match your answer to 3c), though it seems it should. Why is this?
Click here to see answer by macston(5194) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020
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