Question 572250
Let w = width

Let A = area

A = (w - 2)(3w - 2)...This answers part a.

By the way, the answer for part a can also be given as 3x^2 - 8x + 4 after multiplying the factors (w - 2)(3w - 2).

Part b:

A = (10 - 2)(3(10) - 2)

A = (8)(28)

A = 224ft^2


Part c:


A = (9 - 2)(3(9) - 2)


A = (7)(25)


A = 175ft^2