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#1 2005-11-24 12:00:25

kcleigh2
Member
Registered: 2005-11-24
Posts: 13

i have a couple of question for people of they are willing to help me please,

1) the equations connecting the running cost of a piece of apparatus,R,and the number of times it is used in one month,N, are

R=(3N + 15)
----------
8
and

N=  8R
-----    -   5
3
use these equations to calculate

a) the value of R when N=27

b) the value of N when R= 42

c) the value of R when N=0

this is really getting to me please help thanks to anyone who can )

Last edited by kcleigh2 (2005-11-24 12:01:02)

i am really really really rubbish at maths lol lol lol lol lol lol lol lol lol lol lol lol

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#2 2005-11-24 16:43:08

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

Both the equations are the same!
a) When N=27, R=96/12 = 8.
b) When R=42, N= 8*42/3 - 5 = 112-5 = 107.
c) When N=0, R= 15/8

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#3 2005-11-24 23:37:24

kcleigh2
Member
Registered: 2005-11-24
Posts: 13