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#1 2007-02-17 16:47:21

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,969

formula

Monique wrote:

how do i write a formula for this problem:

The cost of renting a car for a day if the Rental Company charges $20 perday and $0.30 per km driven?

Thanks!!

I am moving this to 'Help Me' Section, Monique.
The formula would be
C=20n+0.3d
where C is the Cost in Dollars, n is the number of days and d, the distance in kilometers.


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.

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#2 2007-02-18 13:31:52

Monique
Member
Registered: 2007-02-17
Posts: 22

Re: formula

You're an absolute God, Ganesh! Thanks!

I have another question:  if a person renting the car has only $100 how far can they drive in a day based on the formula C=20n+0.3d?

by now you can probably tell I know absolutely nothing about maths.

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#3 2007-02-18 15:47:45

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,711

Re: formula

C = 100, n = 1, so

C=20n+0.3d

becomes

100=20×1+0.3d

Solving:
100 = 20 + 0.3d
100-20 = 20-20 + 0.3d
80 = 0.3d
80/0.3 = (0.3/0.3)d
266.666... = d

Answer 266.666... km


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#4 2007-02-19 14:39:55

Monique
Member
Registered: 2007-02-17
Posts: 22

Re: formula

Thankyou so muchkiss

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