Answer:
71.2 km²
Step-by-step explanation:
Triangles: 1/2(8)(3.9)=15.6 (2 of them - front and back)
Base: 8x2=16
Side: 4x2=8
Slant:8x2=16
15.6+15.6+16+8+16=71.2
Step-by-step explanation:
If x=3, y=7 when x+y=z
z=3+7
z=10
I assume you want the expression to this so it would be x-y-3
