Answer:The answer is a.
Step-by-step explanation:
If you multiply 12*3 you get 36. The area of a triangle is base * height divided by 2. Using that logic you subtract 3 from the 8. Since the base of the rectangle was 3 and you don't need it. You get 5 multiply 5 by 12 you get 60. Divide that by 2 you get 30. Hope it helps!
