# need help again =)

f is directly proportional to e^3. f = 192 when e = 4

A) wrk out a formjula for f in terms of e

B) wrk out da value of f when e = 8

C) wrk out da value of e when f = 41.472

thnx =)

Posted Thu 7th June, 2012 @ 16:48 by waqar

Im not so sure waqar cuz i aint done dis maths for ages but i think it goes like this (P.S any1 who thiks im wrong plzz say so =D)

~ = shows directly proportional sign

1.) f ~ e^3

f = k x e^3

194 = k x 4^3

194 = 64k

194/64 = k

k =  3

formula :   f = 3 x e^3

2.)  f = 3 x 8^3

f = 1536

3.)  f = 3 x e^3

41.472 = 3 x e^3

41.472/3  = e^3

13.824 = e^3

cube root(13.824) = e

e = 2.4

Waqar im not so sure about his but dont trust me, coz im not so sure about it

anyway it shuld give u a idea!!!

Answered Thu 7th June, 2012 @ 16:58 by Braniac

yeah thnx anywayyyz m8

Answered Thu 7th June, 2012 @ 17:00 by waqar

nps =D

Answered Thu 7th June, 2012 @ 17:02 by Braniac

I did it myself and Beelal is 100% correct :D

Answered Thu 7th June, 2012 @ 20:40 by Nuha

thnx nuha ===> see u can correct me!!!! sign of a a clever person ;D ***

Answered Thu 7th June, 2012 @ 20:45 by Braniac