SRL Archive - News and General

Need some math help!


Rubix

2009-05-07 00:44:30

http://rubix.pastebin.com/m10b18d2c

directions are there, its a take home quiz worth 50 points and its 3x weighted, i don't know how to do it at all :s have any questions just post here asking them.

~RC

marpis

2009-05-07 01:01:16

i could solve those if i knew what 'a over b' means :P blagh, now im going to bed anyway
edit: is it the thing used in propability calculations?

sirlaughsalot

2009-05-07 01:04:51

*realises he did something incredibly dumb to get an easy answer*

Okay, I figured the first one out :P
1.
(x+2)_4=(x-2)_6
x+2_4 - x-2_6=0
3(x+2_4) - 2(x-2_6)=0
3x+6_12 - 2x-4_12=0

Do the math and you get

x-2=0
x=2

Now, there seems to be something flawed, but I cannot put my finger on it. If you have any objections to how I did this then feel free to correct me :)

The Solve for F equation

c=20
c=5_9(f-32)
20=5_9(f-32)
20=5_9f-17_7_9
20+17_7_9=5_9f
37_7_9=5_9f
37_7_9/5_9=f
f=68

Rofl Question 10 is a formula almost

x=-b(+-)sqrt(b^2-4ac_2a) hahaha

tarajunky

2009-05-07 01:24:10

1. (x+2)_4 = (x-2)_6
12(x+2)/4 = 12(x-2)/6
3(x+2)=2(x-2)
3x+6=2x-4
3x-2x=-6-4
x=-10

2. 4_3x + 5_6 = -2_x
6(4/3x) + 6(5/6) = 6(-2/x)
8/x + 5 = -12/x
x(8/x) = x(5) = x(-12/x)
8 + 5x = -12
5x = -20
x=-4

3. 5_x + 1_4 = 3_4x
4(5/x) + 4(1/4) = 4(3/4x)
20/x + 1 = 3/x
x(20/x) + x(1) = x(3/x)
20 + x = 3
x = -17

sirlaughsalot

2009-05-07 01:38:03

Weird, I got the same thing the first time I did 1 (But i didnt check /facepalm) but arent you supposed to do the same thing to each side and if you multiply one times 3 and the other times 2 that shouldnt be right =/ meh…

infested999

2009-05-07 02:31:45

What is your math class called? Geometry? Algebra 2? Calculus?

XcanadamanX

2009-05-07 03:48:25

not calculus. you'd have to take the derivative :p

Blumblebee

2009-05-07 03:53:44

hes 14 its probably like algebra or something similiar (or easier)

x[Warrior]x3500

2009-05-07 04:23:01

yah the max he is in is algebra. probably the standard algebra 1 class in highschool

Brain

2009-05-07 04:42:16

This is algebra, calculus is way easier :p
maybe cuz it's fresh in the mind…but I always had more trouble with advanced algebra over advanced calculus.

mrpickle

2009-05-07 07:00:46

Wouldn't rubix's teacher wonder at his skillz if all of a sudden he knew how to do calculus? =D.

Grunt

2009-05-09 06:33:42

just took the ap calc bc exam yesterday.
I thought that was easier than your homework.

Runescapian321

2009-05-09 06:47:32

From: Grunt
just took the ap calc bc exam yesterday.
I thought that was easier than your homework.


O_O? I'm only in Algebra II, and that seems pretty easy to me (assuming the directions for section #2 are to solve in terms of the other variables, otherwise I don't get that).

Seems like (maybe upper level/honors) Algebra I to me.