You have 2 triangles and 3 rectangles.
Start with a triangle:
area is base side height / 2 -> 4 3 / 2 = 6
The other triangle has the same area: 6
First rectangle: side other side -> 7 5 = 35
Second rectangle: 7 4 = 28
Third rectangle: 7 3 = 21
Now simply add all this together: 6+6+35+28+21 = 96
