| Math problem help | |
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+5RageNrOx SMD_DiaryOfJane {PK}Mirez SuppaSapien3 Froggie_Dude 9 posters |
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Froggie_Dude
Posts : 150 Points : 156 Reputation : 0 Join date : 2010-01-14 Location : Behind you
| Subject: Math problem help Wed Mar 03, 2010 1:39 am | |
| Ok, I have a few questions that are kinda challenging so if you are good at this kind of thing plz help.
1.
Let tn equal the integer closest the √n
For example, t1 = t2 = 1 since √1=1 and √2=1.41 and t3=2 since √3=1.71.
What is the sum of the following? 1/t1 + 1/t2 + 1/t3 + 1/t4 + ... + 1/t2008 + 1/t2009 + 1/t2010
2. Alex chose positive integers a, b, c, d, e, f and completely multiplied out the polynomial product
(1 - x)a(1 + x)b(1 - x + x2)c(1 + x2)d(1 + x + x2)e(1 + x + x2 + x3 + x4)f
After she simplified her result, she discarded any term involving x to any power greater than 6 and was astonished to see that what was left was 1 - 2x. If a > d + e + f and b > c + d and e > c, what value of a did she choose? | |
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SuppaSapien3
Posts : 476 Points : 599 Reputation : 0 Join date : 2009-08-03 Age : 33
| Subject: Re: Math problem help Wed Mar 03, 2010 8:51 am | |
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{PK}Mirez
Posts : 1074 Points : 1107 Reputation : -1 Join date : 2010-01-03 Age : 33 Location : Netherlands
| Subject: Re: Math problem help Wed Mar 03, 2010 11:57 am | |
| 5 obviously
froggie you should consider joining xpt, we need someone who makes the place less gloomy | |
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Froggie_Dude
Posts : 150 Points : 156 Reputation : 0 Join date : 2010-01-14 Location : Behind you
| Subject: Re: Math problem help Fri Mar 05, 2010 12:29 am | |
| haha, but this was a serious question. | |
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SMD_DiaryOfJane
Posts : 49 Points : 75 Reputation : 0 Join date : 2010-02-23 Age : 32
| Subject: Re: Math problem help Fri Mar 05, 2010 1:26 am | |
| 1. answer is 88+(2/3) I too lazy too further simplify for u. (1/t1 + 1/t2)= 1+1=2 (1/t3 + 1/t4...1/t6)= 2 sum of all even numbers (2, 4, 6, 8,...)=2010 ( 2 (1's), 4 (1/2)'s, 6 (1/3)'s etc...) 2-88 sum of every even integer is 1980 2010-1980= 30 30* (1/45)<---- (90/2 gets u the 45 denominator) (total of 90 (1/45)s)=2/3 2* 44(integers from 2-88 the even ones)=88 sum= 88 and two thirds. feel free to flame me if i do this wrong im to lazy to help u out on #2 if u really need help ill try to do it 4 u. | |
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SMD_DiaryOfJane
Posts : 49 Points : 75 Reputation : 0 Join date : 2010-02-23 Age : 32
| Subject: Re: Math problem help Fri Mar 05, 2010 1:33 am | |
| 2nd question i think A=4 not sure :/. | |
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Froggie_Dude
Posts : 150 Points : 156 Reputation : 0 Join date : 2010-01-14 Location : Behind you
| Subject: Re: Math problem help Fri Mar 05, 2010 2:26 am | |
| Thx for help, I got to the part where 2-88 was 1980 then I didn't know what to do with the 30 that was left. I didn't even know where to start with the second one so I thought I'd see if someone else knew how to get it. Thanks. | |
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RageNrOx Admin
ID : 376121 Posts : 1148 Points : 1414 Reputation : 43 Join date : 2009-07-27 Age : 38 Location : France
| Subject: Re: Math problem help Fri Mar 05, 2010 11:15 pm | |
| - SMD_DiaryOfJane wrote:
- 1. answer is 88+(2/3) I too lazy too further simplify for u.
(1/t1 + 1/t2)= 1+1=2 (1/t3 + 1/t4...1/t6)= 2 sum of all even numbers (2, 4, 6, 8,...)=2010 ( 2 (1's), 4 (1/2)'s, 6 (1/3)'s etc...) 2-88 sum of every even integer is 1980 2010-1980= 30 30* (1/45)<---- (90/2 gets u the 45 denominator) (total of 90 (1/45)s)=2/3 2* 44(integers from 2-88 the even ones)=88 sum= 88 and two thirds.
feel free to flame me if i do this wrong im to lazy to help u out on #2 if u really need help ill try to do it 4 u. You're right, 30 seconds with excel to check it ^^ 88,66666667 2nd problem is kinda harder lol | |
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SuppaSapien3
Posts : 476 Points : 599 Reputation : 0 Join date : 2009-08-03 Age : 33
| Subject: Re: Math problem help Mon Mar 29, 2010 8:28 am | |
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Froggie_Dude
Posts : 150 Points : 156 Reputation : 0 Join date : 2010-01-14 Location : Behind you
| Subject: Re: Math problem help Mon Mar 29, 2010 10:39 pm | |
| Sorta not rlly. It was on a big thing of questions we were supposed to look at. | |
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death
ID : 1451210 Posts : 944 Points : 1201 Reputation : 15 Join date : 2010-02-10
| Subject: Re: Math problem help Tue Mar 30, 2010 1:27 am | |
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SMD_bazookatooth
ID : 55555 Posts : 490 Points : 593 Reputation : 0 Join date : 2009-12-04 Age : 74
| Subject: Re: Math problem help Mon Nov 08, 2010 10:53 am | |
| I feel like he posted this just to show off. | |
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Vaga
ID : 712824 Posts : 536 Points : 536 Reputation : -51 Join date : 2010-03-31 Age : 34 Location : pittsburgh, PA
| Subject: Re: Math problem help Mon Nov 08, 2010 6:40 pm | |
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SMD_bazookatooth
ID : 55555 Posts : 490 Points : 593 Reputation : 0 Join date : 2009-12-04 Age : 74
| Subject: Re: Math problem help Mon Nov 08, 2010 9:59 pm | |
| out of all the people I'm glad froggie dude doesnt come on here anymore | |
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{PK}Mirez
Posts : 1074 Points : 1107 Reputation : -1 Join date : 2010-01-03 Age : 33 Location : Netherlands
| Subject: Re: Math problem help Tue Nov 09, 2010 12:09 pm | |
| I disagree, it was nice to have another ESO player here | |
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Andrw_13
ID : 2552530 Posts : 517 Points : 564 Reputation : 2 Join date : 2010-09-11 Age : 30 Location : HOme
| Subject: Re: Math problem help Wed Nov 10, 2010 12:32 am | |
| I didnt know him tho he seems a pretty chilled guy | |
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