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could it be? OMG math
Posted: Wed Apr 29, 2009 9:04 pm
by ThatBluePerson
So today we had the state test that we have to take thanks to NCLB, for my sophomore class. It was Math. I practically finished all 62 questions in about an hour and a half. Except one question:
If I replicated it correctly from memory. Anyways, I spent like the whole day trying to figure out the answer and I just couldn't. I know I will feel like a douche when you guys tell me right answer. But I just kept on trying and trying with everything I could think of and nothing. So now my perfect score streak since 1st grade is broken.
After some cursing out loud and getting escorted to the gym to finish there, I gave up and randomly selected B.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:17 pm
by boast
was there an E. None of the above
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:17 pm
by evilpeta
you sure the correct answer is within those options? lol
idk if im right cuz this is old stuff but the volume of a cilinder is the area of the circunference times the height. area of circunference = pi*radius^2, and height = h.
so:
r = x/2, h = 6x
V = pi*(radius)^2*height
V = pi*(x/2)^2*6x
V = pi*(x^2/4)*6x
V = (3/2)*pi*x^3
so the answer is E) none of the above. or F) this test sucks balls.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:18 pm
by Reise
I suck at this stuff but I know the answer isn't A or B.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:24 pm
by ThatBluePerson
Yeah my algebrator says that the answer is 3PIx^3 which is what I got when I first worked out the problem.
damn TAKS creators.... no there was no E.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:24 pm
by _Angels
evilpeta wrote:you sure the correct answer is within those options? lol
idk if im right cuz this is old stuff but the volume of a cilinder is the area of the circunference times the height. area of circunference = pi*radius^2, and height = h.
so:
r = x/2, h = 6x
V = pi*(radius)^2*height
V = pi*(x/2)^2*6x
V = pi*(x^2/4)*6x
V = (3/2)*pi*x^3
so the answer is E) none of the above. or F) this test sucks balls.
You are my new hero...
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:25 pm
by Locketart
I thought it was 6/4x^3 also.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:30 pm
by ThatBluePerson
_Angels wrote:evilpeta wrote:you sure the correct answer is within those options? lol
idk if im right cuz this is old stuff but the volume of a cilinder is the area of the circunference times the height. area of circunference = pi*radius^2, and height = h.
so:
r = x/2, h = 6x
V = pi*(radius)^2*height
V = pi*(x/2)^2*6x
V = pi*(x^2/4)*6x
V = (3/2)*pi*x^3
so the answer is E) none of the above. or F) this test sucks balls.
You are my new hero...
but isn't 6*1/2=3? or i'm i a math noob?
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:36 pm
by evilpeta
you don't get to multiply 6 times 1/2 since the 1/2 turns into 1/4 due to radius squared.
lets take X out of the equation so it's easier to see.
radius = 1/2, height = 6
Volume = pi * (radius)^2 * height
V = pi * (1/2)^2 * 6
V = pi * 1/4 * 6
V = pi * 3/2
now you can just assume it's x^3 since its a volume, volume is measured in units ^3
meters^3, etc etc.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:43 pm
by EvGa
Like evilpeta said, answer is: (3/2)pi(x^3).
pi*r^2*h
Pi*((1/2)x)^2)*(6x)
=Pi*(1/4)*(x^2)*(6x)
=Pi*(3/2)*(x^3)
=(3/2)*pi*(x^3)
Answer isn't there.
EDIT: Doh evil replied again.. easier to understand the way he put it.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:44 pm
by ThatBluePerson
still.. now that im thinking that 2/3 could of been a 3/2
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:45 pm
by EvGa
You're messing up at the very beginning. Radius = (1/2)x. You have to square the radius, thus you have to square 1/2 AND x. (1/2) squared = (1/4).
So ((1/2)x)^2 = (1/4)x^2
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:46 pm
by evilpeta
that is a common mistake, you're just squaring the X, and not the 1/2 before it.
ps: evga, typo on your first post.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:47 pm
by ThatBluePerson
evilpeta wrote:that is a common mistake, you're just squaring the X, and not the 1/2 before it.
my teacher use to yell at us for that, i learned if (1/2x)^2 then we square both but if 1/2x^2 then the x is only square. but probably since the ^2 is part of the area formula it is assumed that it should be written (1/2x)^2
it all makes sense now T_T
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:49 pm
by EvGa
evilpeta wrote:that is a common mistake, you're just squaring the X, and not the 1/2 before it.
ps: evga, typo on your first post.
AHHH, oh noes where!!?
Oh, I didn't cube the x.. -.-
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:49 pm
by evilpeta
also try to rewrite 1/2x to x/2, since 1 over 2x is different from x over 2. it gets confusing sometimes
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 9:58 pm
by EvGa
Well poo.. I messed that up lol. I don't like combining the fraction with the x. Was trying to keep everything separated. Meant to have parenthesis around the fraction.. so walla, I threw in some more. Think it's fixed now.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:03 pm
by evilpeta
wasn't talking to you. lol
looking at the first picture the "1/2x" is rather confusing without parenthesis. any math teacher or judge will see that as 1 over 2x.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:11 pm
by EvGa
Well I did the same thing in mine
TAKS, so you live in Texas?
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:26 pm
by ThatBluePerson
EvGa wrote:Well I did the same thing in mine
TAKS, so you live in Texas?
lol yes.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:31 pm
by Brago
Its c.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:33 pm
by evilpeta
dear God.
Re: could it be? OMG math
Posted: Wed Apr 29, 2009 10:50 pm
by EvGa
ThatBluePerson wrote:EvGa wrote:Well I did the same thing in mine
TAKS, so you live in Texas?
lol yes.
Ahh, I miss the good ole TAKS. I think they came out with it the last year I had to take mandatory state tests. We had TAAS before that. Good stuff.
Brago wrote:Its c.
Um, no.
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 12:16 am
by Midori
ThatBluePerson wrote:Yeah my algebrator says that the answer is 3PIx^3 which is what I got when I first worked out the problem.
damn TAKS creators.... no there was no E.
You live in Texas? Where?
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 2:14 am
by boast
evilpeta wrote:wasn't talking to you. lol
looking at the first picture the "1/2x" is rather confusing without parenthesis. any math teacher or judge will see that as 1 over 2x.
I thought the same as well. I was like, wtf, these choices aren't even CLOSE to the answer.
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 2:51 am
by ThatBluePerson
X-Lax wrote:ThatBluePerson wrote:Yeah my algebrator says that the answer is 3PIx^3 which is what I got when I first worked out the problem.
damn TAKS creators.... no there was no E.
You live in Texas? Where?
Houston.
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 2:56 am
by s0017
Heh, I took TAKS today as a Junior. I thought the sophomore test was 66 questions though, at least thats what my friend told me. O.o
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 11:18 am
by _Angels
ThatBluePerson wrote:_Angels wrote:evilpeta wrote:you sure the correct answer is within those options? lol
idk if im right cuz this is old stuff but the volume of a cilinder is the area of the circunference times the height. area of circunference = pi*radius^2, and height = h.
so:
r = x/2, h = 6x
V = pi*(radius)^2*height
V = pi*(x/2)^2*6x
V = pi*(x^2/4)*6x
V = (3/2)*pi*x^3
so the answer is E) none of the above. or F) this test sucks balls.
You are my new hero...
but isn't 6*1/2=3? or i'm i a math noob?
lol i have no idea ~_~ i dropped math a long time ago lol.__.
whoever can do this kinda **** is my hero , D:
im stuck at the first ;x
Re: could it be? OMG math
Posted: Thu Apr 30, 2009 11:43 am
by NuclearSilo
pff, piece of cake. Just apply the formula
Re: could it be? OMG math
Posted: Fri May 01, 2009 7:47 am
by +++
NuclearSilo wrote:pff, piece of cake. Just apply the formula
Do you see a formula there?