Posted by **lisaa** on Monday, January 19, 2009 at 8:45pm.

A rectangle has a perimeter of 120 cm.

Write the length of the rectangle as a function of its width.

- math -
**Damon**, Monday, January 19, 2009 at 8:47pm
2 L + 2 W = 120

so

L + W = 60

so

L = 60 - W

- math -
**lisaa**, Monday, January 19, 2009 at 9:06pm
oh yea there's a second part of it. how do i find the range and domain.

I got

domain => x=R<60

range => y=R<60

- math -
**Damon**, Monday, January 19, 2009 at 9:28pm
Neither can be negative !

- math -
**lisaa**, Monday, January 19, 2009 at 9:32pm
hmm

x=R; 0<x<60

y=R; 0<x<60

how's that

- math -
**Damon**, Monday, January 19, 2009 at 9:45pm
I like that better.

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