6 meters, both mm and cm are too small to be reasonable, as lakes are deep enough to have boats on and to swim in.
Answer:
Step-by-step explanation:
11)
x + x + x = 180
3x = 180
x = 60
12)
3x - 17 + x + 40 + 2x - 5 = 180
6x + 18 = 180
6x = 162
x = 27
Answer: 2.5
Step-by-step explanation: