Answers

2014-06-12T21:53:21+08:00
Given:
A = 18 ft²

formula for the area of a rectangle is:
length x width 

lets use:

A = l x w 

solution by trial and error.

so the area must be 18 ft²

let l be any real number greater than 0 but less than or equal to 18

0 < l ≤ 18

assume any value of l greater than 0 but less than or equal to 18

like l = 3ft

 A = 3 x w
18 = 3 x w
w = 6ft

or l = 4ft

18 = 4 x w
w = 4.5 ft

check

A = l x w

for l = 3 
A = 3 x 6
A = 18 ft²

for l = 4 
A = 4 x 4.5
A = 18 ft²
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