View Full Version : finals

guitarboy

05-23-2006, 07:59 PM

well final exams here are tommorrow and thursday and i have been studing my ass of in algebra a subject in which i was perticualy touched by the retard curse i know there are some "math people" on here which have been blessed with the knowledge of algebra geo. and such and they are lucky believe me i once entered a "math forum" by accident once and subsequently had a headache for a week the point of all this is that if anyone on here still believes in it please pray for me thanks

Tired_Of_You

05-23-2006, 08:02 PM

Have you ever heard about punctuation?

sk8ter-hater

05-23-2006, 08:11 PM

Math > Language, that's why.

Endymion

05-23-2006, 08:19 PM

so wait... did you want help with math or just wanted to get a little crying done?

if you want math help, i'm all ears.

(ps: i just found out that i got the top score in my graduate solid state physics class, so i feel oh so radiant.)

sk8ter-hater

05-23-2006, 08:27 PM

(ps: i just found out that i got the top score in my graduate solid state physics class, so i feel oh so radiant.)

Ha, in Texas they got this TAKS, Texas Assesment of Knowledge and Skills, which basically you take almost every year. This year, freshman year, I toook math (algebra, specifically) and reading. I got a perfect score on the math and 47/52 in the reading one. I felt great until I realized Texas is too lenient in their education (http://www.morganquitno.com/edrank.htm).

punker

05-23-2006, 08:41 PM

if you want math help, i'm all ears.

i had an application test over six months ago to get in university (which i failed, i tried it again, but i dont have the results yet) and there was a math question that i havent been able to solve, is about triangles, can i post it so you can try and solve it?

Endymion

05-23-2006, 08:47 PM

i had an application test over six months ago to get in university (which i failed, i tried it again, but i dont have the results yet) and there was a math question that i havent been able to solve, is about triangles, can i post it so you can try and solve it?

of course, i love doing stuff like that. ps: there's also an 'endymion answers your math and science questions' thread somewhere that you can dig up if you want to add it to that. or here. either one.

Endymion

05-23-2006, 08:55 PM

education (http://www.morganquitno.com/edrank.htm).

haha, i'm in one of the dumbest states. but i've known that for a LONG time.

punker

05-23-2006, 09:05 PM

look

the question was in spanish, so i deleted it, but it was like this

"someone built a ramp with 10 meters of height and a base of 20 meters, the value of the "teta" (http://img210.imageshack.us/img210/9097/618pn.jpg ) angle that should be added to the "alfa" (http://img210.imageshack.us/img210/4397/625rc.jpg) angle so the height of the ramp is equal to 15, without changing the base of the ramp, satisfies the next equality:

http://img478.imageshack.us/img478/8421/662nd.jpg

i solved it, but didnt gave me any of the answers, if i can find the sheets where i did it, i'll post it too

Endymion

05-23-2006, 09:44 PM

some quick calculations:

the hypotenuse for the triangle with alpha:

h1 = sqrt(10^2+20^2) = sqrt(1^2*10^2 + 2^2*10^2) = 10*sqrt(5)

the hypotenuse for the triangle with alpha + theta:

h2 = sqrt(15^2+20^2) = sqrt(3^2*5^2 + 4^2*5^2) = 5*sqrt(3^2+4^2) = 25

now:

sin(alpha) = 1/sqrt(5)

cos(alpha) = 2/sqrt(5)

sin(alpha+theta) = 3/5

cos(alpha+theta) = 4/5

sin(alpha+theta) = sin(alpha)cos(theta)+cos(alpha)sin(theta)

cos(alpha+theta) = cos(alpha)cos(theta)-sin(alpha)sin(theta)

3/5 = 1/sqrt(5)*cos(theta) + 2/sqrt(5)*sin(theta)

4/5 = 2/sqrt(5)*cos(theta) - 1/sqrt(5)*sin(theta)

multiply the second equation by two and add to the first:

3/5+8/5 = 1/sqrt(5)*cos(theta) + 2/sqrt(5)*sin(theta) + 4/sqrt(5)*cos(theta) - 2/sqrt(5)*sin(theta) =>

11/5 = 5/sqrt(5)*cos(theta) =>

cos(theta) = 11*sqrt(5)/25

sKratch

05-23-2006, 09:49 PM

I was gonna take a crack at it but I can never keep the equations straight where you take a trig function of a sum of angles and split it up etc.

punker

05-24-2006, 09:57 AM

cheers dude, thanks a lot, i was having a hard time with that

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