<PRE><B>Question 1119750</B>
perimeter = 2 * length + 2 * width.


perimeter = 30 cm
width = 5 cm


equation becomes 30 = 2 * length + 2 * 5


simplify to get 30 = 2 * length + 10


subtract 10 from both sides of the equation to get:


30 - 10 = 2 * length


combine like terms to get:


20 = 2 * length


divide both sides of the equation by 2 to get:


20 / 2 = length


simplify and solve for length to get:


length = 10.


length = 10 and width = 5


2 * length + 2 * width = 2 * (length + width) = 2 * (15) = 30


solution is:


length = 10 cm.


</PRE>