The answer is identity property of addition.
Answer:
12/7
Step-by-step explanation:
The similarity ratio, I believe, is 2:3.
Because the lengths are 6 and 9 (2:3), the widths are 8 and 12 (2:3), and the heights are 6 and 4 (2:3).
256 being rounded would become 260 and 321 would become 320 so adding up the estimates the would be 580 (real answer is 577)
