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math
Oct 28, 2009 17:19:27 GMT -5
Post by Whateversam on Oct 28, 2009 17:19:27 GMT -5
okay. so mary already said that this wouldn't work out for her because of the time limit on her computer time and stuff. but i don't have ur email rue and all so can we possibly study together... stupid. i no. but i need all the help i can get. i know they said they were having a study session at borders (or were trying 2) but i don't know the time and my parents won't drive me to borders. its probably already started already 2.
so...
first question. #7. this is probably the easiest one 2.
the question is: the figure is a rectangle that has a length of x+5 and a width of 2x. Write and simplify a rational expression for the ratio of the perimeter to the area of the given figure.
what exactly are we supposed to do. just put x+5 over 2x and simplify it if possible?
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math
Oct 28, 2009 18:47:31 GMT -5
Post by soulmusician on Oct 28, 2009 18:47:31 GMT -5
never mind erm...... 6x+10 ----------- 4x^2  ?? probably not right....... |
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math
Oct 28, 2009 19:39:29 GMT -5
Post by Whateversam on Oct 28, 2009 19:39:29 GMT -5
that doesn't make any sense though. the 4x ^2 does because that would be 2x times 2x but the 6x+10 doesn't.
oh well. on the test ill probably just put something like 2x+10 over 4x. i can't simplify it either...
thats bad. does anybody no if rue knows the answer?
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math
Oct 28, 2009 19:44:08 GMT -5
Post by Whateversam on Oct 28, 2009 19:44:08 GMT -5
never mind. that dosen make sense. don't listen to me. i sorta missed the part that said area to perimeter. my bad. oh wells. it makes sense. just put the perimeter over the area. wait. wouldn't the area be 2x^2+10x? |
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math
Oct 29, 2009 6:36:23 GMT -5
Post by soulmusician on Oct 29, 2009 6:36:23 GMT -5
wah i typed it wrong~~~~~~~~~~
I'm sorry sam~~~~~~~~~~~
over 4x^4
my bad, sorry
perimiter:
x+5+x+5+4x+4x=6x+10
area:
x^2+25 is difference of squares
sos (x+5)(x-5)(4x^2)
(4x^3+20x^2)(x-5)
foil method......
4x^4-20x^3+20x^3-100x^2
20x^3's cancel out...
4x^4-100x^2
oh, sorry, got it wrong the first time...
moving on...
so that'd be 6x+10
-----------
4x^4-100x^2
nothin cancels out, sos......
crap. if i work this a third time, I'll prob get a diff answer again
don't ask me for math help, I'm failing.
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math
Oct 29, 2009 17:06:59 GMT -5
Post by Whateversam on Oct 29, 2009 17:06:59 GMT -5
aww... its okay mary! you'll pull through! ur the smart one after all.
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math
Oct 30, 2009 7:10:24 GMT -5
Post by soulmusician on Oct 30, 2009 7:10:24 GMT -5
thats what worries me......
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math
Oct 30, 2009 7:24:27 GMT -5
Post by Whateversam on Oct 30, 2009 7:24:27 GMT -5
thanks a lot mary. that really makes us feel better....
we're screwed.
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math
Oct 30, 2009 20:44:08 GMT -5
Post by soulmusician on Oct 30, 2009 20:44:08 GMT -5
WAH IM SORRY~
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yp
Full Member
Posts: 141
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math
Nov 8, 2009 18:18:20 GMT -5
Post by yp on Nov 8, 2009 18:18:20 GMT -5
Pardon the probably useless and outdated post, but I believe the answer is:
3x+5
x^2+10x
I might be wrong as I have often been.
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math
Nov 9, 2009 8:07:57 GMT -5
Post by soulmusician on Nov 9, 2009 8:07:57 GMT -5
That's ok, thank you.
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yp
Full Member
Posts: 141
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math
Nov 9, 2009 20:58:47 GMT -5
Post by yp on Nov 9, 2009 20:58:47 GMT -5
I'm so sorry. I just had to answer that math problem.
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math
Nov 11, 2009 16:59:16 GMT -5
Post by soulmusician on Nov 11, 2009 16:59:16 GMT -5
Really, it's ok. It helped.
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math
Nov 11, 2009 17:07:15 GMT -5
Post by Whateversam on Nov 11, 2009 17:07:15 GMT -5
ur helpfuls.
and yeah. i^18 was -1 right???
and there was another one too. i don't remember which one it was though.
oh yeah there was one that gave u answer like 26+48t. Were you supposed to take out a 2 or just leave it like that?
srrys. i fail at math.
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yp
Full Member
Posts: 141
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math
Nov 11, 2009 17:16:00 GMT -5
Post by yp on Nov 11, 2009 17:16:00 GMT -5
Yes. The answer is -1 and no you can't simplify that any further, so don't take away the 2.
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