If you could explain to me how you get the answer, that will be great!

Answer: 130.4
Step-by-step explanation:
find the area of the rectangles
5(8)=40
5(8)=40
4(8)=32
find the area of both of the triangles
formula: 2(bh÷2)
substitute: 2(4 x 4.6 ÷ 2)
solve
2(9.2)
18.4
add all of the areas
40+40+32+18.4=130.4