surface area =(8×6+6×4+4×8)×2=28cm?

2. The area of this trademark paper =(1+8)×2×12=432cm?

the volume of 3 or 1 such pieces of wood =1×.24×5=12m?

4. (1) The glass area required to make this fish tank is at least 8× 5+(8+5 )× 2× 6 = 196 dm?

(2) The volume of 8 goldfish =(4.15-4)×8×5=.6dm? =6cm?

so the average size of each goldfish =6÷8=75cm?