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02-22-2008, 06:17 PM
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#1 (permalink)
| BattleForums Senior Member
Join Date: Nov 2003 Location: north carolina Age: 19 Posts: 4,051
| Math Problem
Y=2908x
100-x
Suppose a cost benefit model is given by the equation above, where Y is the cost in thousands of dollars of moving X% of pollutants. What % of pollutant can be removed for $40,000?
Homework where Im given a A,B,C,D answer but what I get doesn't match. Help please?
AREN'T YOU SUPPOSED TO:
Substitute 40 in for Y, and multiply both sides by 100-x to cancel out 100-x on bottom, and leave yourself with:
(100-x)40=2908X -> 4000-40x=2908x
4000-40x(+40x)=2908x(+40x)
4000=2948x
and then divide both sides by 2948 to get X?
__________________ "The Doors of Perception" She danced around and round
To a guitar melody
From the fire her face
Was all aglow
How she enchanted me
Oh how I’d like to hold her near
And kiss and forever whisper in her ear
Last sexed by Darkmatter : 05-2-2005 at 5:47 PM.
Last edited by Pains Requiem; 02-22-2008 at 06:23 PM.
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02-22-2008, 06:49 PM
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#2 (permalink)
| Respected Member
Join Date: Aug 2002 Location: Canada Age: 20 Posts: 11,406
| Re: Math Problem
Quote:
Originally Posted by Pains Requiem  Y=2908x
100-x
Suppose a cost benefit model is given by the equation above, where Y is the cost in thousands of dollars of moving X% of pollutants. What % of pollutant can be removed for $40,000?
Homework where Im given a A,B,C,D answer but what I get doesn't match. Help please?
AREN'T YOU SUPPOSED TO:
Substitute 40 in for Y, and multiply both sides by 100-x to cancel out 100-x on bottom, and leave yourself with:
(100-x)40=2908X -> 4000-40x=2908x
4000-40x(+40x)=2908x(+40x)
4000=2948x
and then divide both sides by 2948 to get X? | if it is 40,000 why substitute in 40?
or am i missing something
__________________ 
Watch the Game, Learn the Game, Control the Game.
To Those Who Think,
To Those Who Dare,
To Those Who Do,
To Those Who Succeed.
Success is nothing more than taking advantage of an opportunity. Quote:
Mapmaker FAQ:
1)Can the map editor-
Yes, it can.
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02-22-2008, 06:55 PM
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#3 (permalink)
| BattleForums Senior Member
Join Date: Nov 2003 Location: north carolina Age: 19 Posts: 4,051
| Re: Math Problem
Because Y is already in thousands.
It's a question on my girlfriends take-home math quiz and she's worked everything out like it is (even using 40,000) and still isnt getting a correct answer. Try working it yourself, reading the problem carefully. I'm not sure that X is all that your after in that problem. That shouldn't give you a % answer.
__________________ "The Doors of Perception" She danced around and round
To a guitar melody
From the fire her face
Was all aglow
How she enchanted me
Oh how I’d like to hold her near
And kiss and forever whisper in her ear
Last sexed by Darkmatter : 05-2-2005 at 5:47 PM. | |
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02-22-2008, 09:59 PM
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#4 (permalink)
| [ Official Forum Ninja ]
Join Date: Sep 2006 Location: Roanoke VA Posts: 1,404
| Re: Math Problem
Wait, is that supposed to be x MINUS 100, or x EQUALS 100? | |
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02-23-2008, 02:33 PM
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#5 (permalink)
| Respected Member
Join Date: Aug 2002 Location: Canada Age: 20 Posts: 11,406
| Re: Math Problem
Quote:
Originally Posted by Ninja_Blue Wait, is that supposed to be x MINUS 100, or x EQUALS 100? | Y= 2908x
....100-x
__________________
Watch the Game, Learn the Game, Control the Game.
To Those Who Think,
To Those Who Dare,
To Those Who Do,
To Those Who Succeed.
Success is nothing more than taking advantage of an opportunity. Quote:
Mapmaker FAQ:
1)Can the map editor-
Yes, it can.
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02-23-2008, 02:52 PM
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#6 (permalink)
| [F-Zero Fanatic]
Join Date: May 2003 Location: Phantom Road Age: 22 Posts: 15,141
| Re: Math Problem
If its solve by substitution. I believe you replace the Y with the bottom equation to work out X. Then fill in the answer for X to get Y.
__________________ 
The Purpose of DTD is not to show off how good you are.
But to do an insane flying move and landing at 3000 km/h.
Hopefully, without crashing into something or flying off in the process.
F-Zero Forever!
One of Wrestlemania 24's Epic Moments
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02-23-2008, 03:25 PM
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#7 (permalink)
| Aya Matsuura is awesome
Join Date: Nov 2002 Location: Trieste, Friuli-Venezia Giulia Age: 20 Posts: 14,906
| Re: Math Problem
This question is so stupid, I don't feel like answering it - no offence. But a note: Nobody has mentioned multiplying by 100 to get a percentage.* | |
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02-23-2008, 04:22 PM
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#8 (permalink)
| o
Join Date: May 2003 Posts: 3,520
| Re: Math Problem
An Asian turning down the chance to do math? What has this stereotypical world come to!?
__________________  Quote: |
Originally Posted by Chris And no offense, that goes for all you guys as well who think the same ideas she does. You are either with us, or you are part of the problem and need to be weeded out. So I suggest you decide right now. | Quote: |
Originally Posted by Chris I am saying this now, you can believe her and eventually be on the admin and staff hit list with her. But at least understand I have my own side of the story. | | |
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02-23-2008, 05:28 PM
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#9 (permalink)
| Respected Member
Join Date: Jan 2004 Age: 19 Posts: 9,513
| Re: Math Problem
Please don't tell me this is grade 11 or 12 math.
and yea this is a very stupid question, i did this in like grade 3 totdally lawl! | 
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02-23-2008, 06:33 PM
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#10 (permalink)
| BattleForums Senior Member
Join Date: Nov 2003 Location: north carolina Age: 19 Posts: 4,051
| Re: Math Problem
Me and her both have worked it out but her answer doesn't match any of the teacher's answers.
The answer we got was 1.36 something I believe, but thats not an answer.
Suppose a cost benefit model is given by the equation above, where Y is the cost in thousands of dollars of moving X% of pollutants. What % of pollutant can be removed for $40,000?
This is the part that I think is tricky. She worked out her problems the same way in school and got those answers right.
__________________ "The Doors of Perception" She danced around and round
To a guitar melody
From the fire her face
Was all aglow
How she enchanted me
Oh how I’d like to hold her near
And kiss and forever whisper in her ear
Last sexed by Darkmatter : 05-2-2005 at 5:47 PM. | |
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02-23-2008, 11:47 PM
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#11 (permalink)
| o
Join Date: May 2003 Posts: 3,520
| Re: Math Problem
You could just plug in the teachers answers to see if they check out.
__________________ Quote: |
Originally Posted by Chris And no offense, that goes for all you guys as well who think the same ideas she does. You are either with us, or you are part of the problem and need to be weeded out. So I suggest you decide right now. | Quote: |
Originally Posted by Chris I am saying this now, you can believe her and eventually be on the admin and staff hit list with her. But at least understand I have my own side of the story. | | |
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02-24-2008, 02:22 AM
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#12 (permalink)
| [F-Zero Fanatic]
Join Date: May 2003 Location: Phantom Road Age: 22 Posts: 15,141
| Re: Math Problem
Quote:
Originally Posted by Pains Requiem Me and her both have worked it out but her answer doesn't match any of the teacher's answers.
The answer we got was 1.36 something I believe, but thats not an answer.
Suppose a cost benefit model is given by the equation above, where Y is the cost in thousands of dollars of moving X% of pollutants. What % of pollutant can be removed for $40,000?
This is the part that I think is tricky. She worked out her problems the same way in school and got those answers right. | If that's the case.
Then you replace Y with 40k and then divide both ends of the equation by 2938.
Why that 100-x there is what I don't get.
__________________
The Purpose of DTD is not to show off how good you are.
But to do an insane flying move and landing at 3000 km/h.
Hopefully, without crashing into something or flying off in the process.
F-Zero Forever!
One of Wrestlemania 24's Epic Moments
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02-26-2008, 06:53 PM
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#13 (permalink)
| BattleForums Senior Member
Join Date: Nov 2003 Location: north carolina Age: 19 Posts: 4,051
| Re: Math Problem
Thjats 2908X DIVIDED by 100-x
The thing is, yeah she did that to get the answer but she wanted to know how to do it. She wanted to make sure she knew how to do it. Thats her college algebra class :/
__________________ "The Doors of Perception" She danced around and round
To a guitar melody
From the fire her face
Was all aglow
How she enchanted me
Oh how I’d like to hold her near
And kiss and forever whisper in her ear
Last sexed by Darkmatter : 05-2-2005 at 5:47 PM. | |
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02-26-2008, 08:16 PM
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#14 (permalink)
| BattleForums Senior Member
Join Date: Jul 2003 Age: 20 Posts: 2,458
| Re: Math Problem
college algebra???
Shouldn't she be taking Calculus, pre-calac at the very least??
at the end I got .136 for x, if you multiply that by 100% you get 13.6%....is that what you want?? | |
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02-26-2008, 08:32 PM
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#15 (permalink)
| o
Join Date: May 2003 Posts: 3,520
| Re: Math Problem
Quote:
Originally Posted by DigitalElite college algebra???
Shouldn't she be taking Calculus, pre-calac at the very least??
at the end I got .136 for x, if you multiply that by 100% you get 13.6%....is that what you want?? |
Here it depends what you made on your ACT Math score and what degree you're going for. I had to take College Algebra. I think if you score high enough you don't have to take it. | |
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02-27-2008, 12:33 AM
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#16 (permalink)
| [F-Zero Fanatic]
Join Date: May 2003 Location: Phantom Road Age: 22 Posts: 15,141
| Re: Math Problem
Quote:
Originally Posted by Pains Requiem Thjats 2908X DIVIDED by 100-x
The thing is, yeah she did that to get the answer but she wanted to know how to do it. She wanted to make sure she knew how to do it. Thats her college algebra class :/ | 40000 = 2938x
40000/2938 = 2938x/2938
13.61470.... = x
13.61470 / 100 <--- not 100 - x...
13.61%
Don't you think that is a little too.... obvious?
__________________
The Purpose of DTD is not to show off how good you are.
But to do an insane flying move and landing at 3000 km/h.
Hopefully, without crashing into something or flying off in the process.
F-Zero Forever!
One of Wrestlemania 24's Epic Moments
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02-27-2008, 07:17 PM
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#17 (permalink)
| BattleForums Senior Member
Join Date: Jul 2003 Age: 20 Posts: 2,458
| Re: Math Problem
Quote:
Originally Posted by Chris 40000 = 2938x
40000/2938 = 2938x/2938
13.61470.... = x
13.61470 / 100 <--- not 100 - x...
13.61%
Don't you think that is a little too.... obvious? | Hell, I didn't even know college algebra was offered at my school until I looked it up, so anything is possible I guess? | |
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02-27-2008, 09:35 PM
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#18 (permalink)
| [F-Zero Fanatic]
Join Date: May 2003 Location: Phantom Road Age: 22 Posts: 15,141
| Re: Math Problem
College Algebra was only designed for people that either sucked at math, forgot how it worked, or is a requirement for sciences.
__________________
The Purpose of DTD is not to show off how good you are.
But to do an insane flying move and landing at 3000 km/h.
Hopefully, without crashing into something or flying off in the process.
F-Zero Forever!
One of Wrestlemania 24's Epic Moments
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02-27-2008, 10:50 PM
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#19 (permalink)
| BattleForums Sophomore Member
Join Date: Mar 2004 Location: Virginia Age: 18 Posts: 1,019
| Re: Math Problem
You guys do realize that there is much harder algebra than this, right?
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02-27-2008, 10:59 PM
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#20 (permalink)
| [F-Zero Fanatic]
Join Date: May 2003 Location: Phantom Road Age: 22 Posts: 15,141
| Re: Math Problem
Yeah, why do you think Calculus takes that position?
__________________
The Purpose of DTD is not to show off how good you are.
But to do an insane flying move and landing at 3000 km/h.
Hopefully, without crashing into something or flying off in the process.
F-Zero Forever!
One of Wrestlemania 24's Epic Moments
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