Mashaal Masha
The area $A$, in square centimeters, of a rectangular cutting board can be represented by the expression $w(w+9)$, where $w$ is the width, in centimeters, of the cutting board. Which expression represents the length, in centimeters, of the cutting board?
Difficulty: Medium
A: 

$w(w+9)$

B: 

$w$

C: 

$9$

D: 

$(w+9)$

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