Re: Maths- Gym for Brainiacs

by RealGunner Sun Apr 15, 2012 2:48 pm

2)

is it

2002 * 222 ?

by Babun Sun Apr 15, 2012 3:41 pm

RealGunner wrote:2)

is it

2002 * 222 ?

No, you're answer is off eco smile

P.S. which game is your avatar from?

by Ganso Sun Apr 15, 2012 4:32 pm

syndicate babun

by RealGunner Sun Apr 15, 2012 8:49 pm

yea syndicate

by fatman123 Tue Apr 17, 2012 12:46 am

sorry quick question, does arithmetic mean have the same formula as population mean?

thanks

by Babun Tue Apr 17, 2012 3:25 am

fatman123 wrote:sorry quick question, does arithmetic mean have the same formula as population mean?

thanks

Not sure what you mean hmm

Back to bed...

by spanky Tue Apr 17, 2012 11:15 am

stitches are 20meters llong, those lines divide each side by 1/6 of the total length, with similar triangles we come up with the formula 8/6*(1+2+3+4+5)=8/6*(15)=20m

and ps babun, please change your avatar back to that smiling baboon, i cant take you seriously with this current avatar eco smile

by Babun Tue Apr 17, 2012 2:40 pm

spanky489 wrote:stitches are 20meters llong, those lines divide each side by 1/6 of the total length, with similar triangles we come up with the formula 8/6*(1+2+3+4+5)=8/6*(15)=20m

and ps babun, please change your avatar back to that smiling baboon, i cant take you seriously with this current avatar

Look at my signature if you don't like the avatar eco smile

Your answer is correct.

by spanky Tue Apr 17, 2012 3:47 pm

fatman123 wrote:sorry quick question, does arithmetic mean have the same formula as population mean?

thanks

i dont tihnk so, arithmetic mean is (sum of samples)/(number of samples)
and if i havent forgotten population mean can be calculated with different types of statistical distributions, arithmetic mean being one of them.

by fatman123 Thu Apr 19, 2012 2:50 am

http://3.141592653589793238462643383279502884197169399375105820974944592.com/
thought you guys would like it

spanky489 wrote:

fatman123 wrote:sorry quick question, does arithmetic mean have the same formula as population mean?

thanks

i dont tihnk so, arithmetic mean is (sum of samples)/(number of samples)
and if i havent forgotten population mean can be calculated with different types of statistical distributions, arithmetic mean being one of them.

yeah your right, i asked my lecturer

by beatrixasdfghjk. Thu Apr 19, 2012 4:21 am

fatman123 wrote:http://3.141592653589793238462643383279502884197169399375105820974944592.com/
thought you guys would like it

I got it, lots of fun Razz

.

by spanky Thu Apr 19, 2012 7:55 pm

next questin plz babun Clubber

by Babun Fri Apr 20, 2012 11:29 pm

Sorry, I was overly busy this week. I'll post new questions tomorrow.

by Babun Thu Apr 26, 2012 12:47 pm

Topic is Integration by substitution

∫(4x - 8 ) (2x - 5)^7 .dx where u = 2x - 5

Whoever solves this question fast, will get a funny question from me. Time limit is until Friday.

by spanky Thu Apr 26, 2012 1:02 pm

Immortal Babun wrote:Topic is Integration by substitution

∫(4x - 8 ) (2x - 5)^7 .dx where u = 2x - 5

Whoever solves this question fast, will get a funny question from me. Time limit is until Friday.

ill solve it when i get home, got an exam in 2 hours Very Happy

by Babun Thu Apr 26, 2012 1:07 pm

Good luck!

by kiranr Thu Apr 26, 2012 1:28 pm

spanky489 wrote:
ill solve it when i get home, got an exam in 2 hours

Good luck Spanky.

by spanky Thu Apr 26, 2012 5:39 pm

thanks guys, such a stupid exam --> product developement and engineering design, it didnt go to bad though.

as for the integral goes heres what i came up with:

integral (4x-8 )*(2x-5)^7 dx with the substitution variable being u=2x-5
so we have integral (2u+2)*u^7 du
= 2/9 8 u^9 + 2/8 u^8 + C = 2/9 * (2x-5)^9 + 2/8 (2x-5)^8 + C

by kiranr Thu Apr 26, 2012 5:52 pm

spanky489 wrote:thanks guys, such a stupid exam --> product developement and engineering design, it didnt go to bad though.

as for the integral goes heres what i came up with:

integral (4x-*(2x-5)^7 dx with the substitution variable being u=2x-5
so we have integral (2u+2)*u^7 du
= 2/9 8 u^9 + 2/8 u^8 + C = 2/9 * (2x-5)^9 + 2/8 (2x-5)^8 + C

I hate engineering design.

Wouldn't the integral be (u+1)*u^7 du ?

by Babun Thu Apr 26, 2012 8:14 pm

spanky489 wrote:thanks guys, such a stupid exam --> product developement and engineering design, it didnt go to bad though.

as for the integral goes heres what i came up with:

integral (4x-8 )*(2x-5)^7 dx with the substitution variable being u=2x-5
so we have integral (2u+2)*u^7 du
= 2/9 8 u^9 + 2/8 u^8 + C = 2/9 * (2x-5)^9 + 2/8 (2x-5)^8 + C

Happy for you eco smile

Substitution alone isn't enough, you have to calculate

du/dx=(2x-5)'=2 <=> dx= 0.5 du

eco smile

∫ (2u+2)*u^7*0.5 du= ∫(u+1)*u^7 du= ∫u^8+u^7 du= 1/9*u^9+ 1/8*u^8+c

Resubstitution: u=2x-5

1/9*(2x-5)^9+ 1/8*(2x-5)^8+c

Spanky, you'll receive your funny question tomorrow eco smile

by spanky Thu Apr 26, 2012 11:10 pm

it cancels out when u resubstitute it

edit: nvm ur right du=2dx

by Babun Fri Apr 27, 2012 10:10 am

Spanky's reward eco smile

topic: analysis
difficulty: hard
requirements: unknown

David Alaba walks his dog, Shtuppid, in the morning. Shtuppid rans away from his master and stays somewhat 35m afar from him. David calls him, waves with his hand etc. but Shtuppid doesn't react at all Suddenly, he sees a rabbit and runs after it perpendicular towards his master's position. Alaba chases after him always running towards his dog's current position. After a mini marathon, he catches him.

The question: how much of a distance did the dog cover? Assume that Alaba's and Shtuppid's velocities are constant and that Alaba runs 4/3 times faster than his dog.

by beatrixasdfghjk. Fri Apr 27, 2012 10:14 am

Wait, so Shtuppid only runs perpendicular to the bit between his initial position and Alaba's initial position?

by Babun Fri Apr 27, 2012 10:34 am

beatrixasdfghjk. wrote:Wait, so Shtuppid only runs perpendicular to the bit between his initial position and Alaba's initial position?

Maths- Gym for Brainiacs - Page 16 7aumlc8u

by beatrixasdfghjk. Fri Apr 27, 2012 11:32 am

Is that how you mark right angles?
We do square thingys .__.

by kiranr Fri Apr 27, 2012 12:10 pm

Only Spanky can solve it?

by Sponsored content