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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