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fuck yeah ! 317

how can the ionic equation of the neutralisation of NaOH and HCl be written as either: H+ + OH- >>> H20 or H30+ + oh- >>> 2H20??

the four unit stuffs just the theory behind why we use y2. its because we take slices of discs which each resemble a circle.

you expand the rhs binomally aswell and u get something like this (10c0+10c1x+...+10c10x^10)=(1+x)(9c0 + 9c1x+ 9c2x^2+.........+ 9c9x9) then equate the coefficients of x^4 so you get LHS=10c4x^4 and RHS= 1.9c4x^4 + x(9c3x^3) = 9c4x^4 + 9c3x^4 hence 10c4= 9c4+9c3

o ok yeah forgot about general yeah i got given the choice to do the 2 unit exam extra time to study things that will count to my UAI

you'd think so. unless you had really ridiculous answers and reasonings

how can they have the 3 maths papers at the same time? shit wouldnt work

yeah you should defo be droppin if you got 0. the lowest ive got is 70% when i was forced to do a test after being away at for half a term coz i was sick.

multiply both sides by (x+2)(x-2) sode then you get: 2-x = a(x-1) + b(x+2) and equate the coefficient of x and the constants you get 2= 2b -a (1) and......-1=a+b (2) (1)+(2) 1=3b b= 1/3, a =-4/3

in a physics test last year a mate of mine who was doin physics at the time wrote at the end "epic fail" and she ticked it almost more hilarious than her teaching abilities

i would have thought the circle would occupy all quadrants except the fourth??? yeah like 3unitz's

is it missing stuff? like where theres the 2 pluses and the unpaired parentheses??? but yeah this question looks ridiculous is step 3 hard to prove??

what i've always done if theres a question like that, i treat it as (x2+(-1/x))6 so then you have 6Ck. [x2]6-k.(-1)k/(x)k then once you find k if k is even, you know it will be a positive coefficient so i would say what you've done is incorrect, but hey ure much smarter than me

http://community.boredofstudies.org/showthread.php?t=22879 thats got a pretty good summary

you can use the fact that sin-1x + cos-1x = pi/2 and make substitutions like in sin-1x - cos-1x = pi/12 >>> sin-1x+sin-1y=7pi/12 then do the same for the other equation so u have them both in terms of inverse sines then add them together

the preliminary excel book does perms and combs pretty good. or you could get something like that phoenix past paper questions as you can then practise all the topics

once you get the expression for velocity change cos2t into 2cos^2t - 1 then you have v=cost-2cos^2t-1 set v=0 and the discriminant is less than zero, therefor never = 0 therefore never at rest

by the way, i didnt mean that in a mean way. but those ppl are pretty insane

how about 3 variables? dx/dt=dx/dA X dA/dv X dv/dt dv/dt=9.8 get dv/dA by differentiating A= .... twice and sub in x??

im just wondering would it be acceptable to use projectile motion from 3 unit maths to solve physics questions?? because my physics teacher can't explain things well so i never understood projectile motion in physics? or would calculus be bad in the exam?? thanks