Math Is Fun Forum

d1whohatesmath

Member

Registered: 2010-02-08

Posts: 26

solving with variables.Urgent!

I am horrible at  math.we  are basicly enemies,so yeah.
problem:

A window is 21 inches wide,and its  perimeter is 112 inches.
What is the length of the window?

How do I go about  solving this?
thanks to all who reply!!!

Last edited by d1whohatesmath (2010-02-08 12:57:48)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: solving with variables.Urgent!

Hi d1whohatesmath;

Math is hard, everyone is bad at it. With some practice you get better, just like anything else.

Start with the perimeter formula:

P = 2 L + 2 W where W is the width and L is the length and P is the perimeter. Now just plug in.

112 = 2 * 21 + 2 L Now we solve for L

112 = 42 + 2L  Subtract 42 from both sides.

70 = 2L Divide by 2

L = 35

The length of the window is 35 inches.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

d1whohatesmath

Member

Registered: 2010-02-08

Posts: 26

Re: solving with variables.Urgent!

:)thank you! this was rlly impportant.You  really helped,thnx!:D

Last edited by d1whohatesmath (2010-02-09 12:44:12)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: solving with variables.Urgent!

Hi Omaima;

Glad to help.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.