Answer:
Wait do you mean 8r^3-64r^2+r-8?
Step-by-step explanation:
Answer:
r= 5
Step-by-step explanation:
Answer:
The surface area of the lower rectangle is 20cm x 4cm= 80 square cm
the surface area of the two triangles is 12 square centimetres
the surface area of one of the top rectangular faces is 20×5= 100 square centimetres
the surface area of the other is 20×3= 60 square centimetres
80+12+60+100=252 square centimetres is the surface area of the polyhydron
The answer is B .greater than 6
