Answer:
The equation that models this problem is w(4 + w) = 12
Explanation:
we know that
The area of a rectangle is
![A=LW](https://img.qammunity.org/2020/formulas/mathematics/high-school/3j0ob8ofk1s943d3rmpkx8tdoddrtl3gew.png)
we have
![A=12\ in^2](https://img.qammunity.org/2020/formulas/mathematics/high-school/7q3c8g2z36nwhgbb498uap55ebnrrmikgh.png)
so
-----> equation A
----> equation B
substitute equation B in equation A and solve for W
![12=(W+4)W](https://img.qammunity.org/2020/formulas/mathematics/high-school/wnrqacx9oqm2cx1ocrdziy94zu5oa7h0jg.png)
therefore
The equation that models this problem is w(4 + w) = 12