$30 because 12/6 = 2 so 15 x 2 = 30
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At first find the area of rectangle:
(x + 4)*(x + 1) = x^2 + 5x + 4
Then find the area of triangle:

Then you must do like this
Area of rectangle - Area of triangle = Area of the shaded
x^2+5x+4 - (

)
I think its C im not sure if im right though.