Answer:
C
Step-by-step explanation:
You can decompose it into two triangles and one rectangle. The rectangle has a length of 4 and the width is 5. The area of the rectangle is 20.
The right triangle has a height of 5 and a base of 1. You multiply it to get 5 then divide by 2. The right triangle has an area of 2.5.
The left triangle has a height of 5 and a base of 3. (7cm - 4 cm) Multiply to get 15 and divide by 2. The left triangle has an area of 7.5.
Add all three up.
20 + 2.5 +7.5
30
