Answer:
the answer to the question is 12:3
12 : 3
Step-by-step explanation:
You put the depth of the deep before the depth of the shallowness to get the ratio. The ratio could be written like,
12 / 3
12 to 3
1
(3²-2³)⁶⁶ = (9 - 8)⁶⁶ = (1)⁶⁶ = 1
A. 21