an open system can be affected by the outside environment.
it has flows of information, energy, and/or matter between the system and its environment, and the system adapts to the exchange.
hope i helped! good luck.
Answer: It depends on what you mean because slavery is still alive today unfortunately in other countries. I'm assuming you mean African American slavery in the USA. Your answer would be from the 1600s - 1865. But at the same time, not every state started slavery at the same time. For instance, Georgia didn't start until the 1700s so it varies, but the first state was Massachusetts in 1619.
16+x=12
move 16 to the other side
sign changes from +16 to -16
so to get x by itself
16-16+x=12-16
x=12-16
x=-4
Answer: x=-4
I believe it is b. citizen participation should be optional
