Math Is Fun Forum

kcleigh2

Member

Registered: 2005-11-24

Posts: 13

please help me !!!

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)

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

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,390

Re: please help me !!!

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

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

kcleigh2

Member

Registered: 2005-11-24

Posts: 13

Re: please help me !!!

thank you for helping me i wouldnt of known where to start thanks again.

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