You can find the area of the rectangle and the triangle separately and then add them together which would result in 330in. I personally do not think you should use the trapezoid formula even though they said it is a trapezoid (a trapezoid is usually not shaped like that) but if you want to it would result in 270in.
Its B because if you do the relationship right then your answer will be B
Answer:
3x+4y-12=0
y intercept = -constant term/coefficient. of y
= 12/4
=3