Which of these were not a preface to the civil war?

1.) dred scott court case

2.) john brown and the raid on harpers ferry

3.) the compromise of 1850

4.) the underground railroad

The correct option is 4. The domain of the function are all real numbers greater than or equal to –3.

Step-by-step explanation:

Domain is the set of all possible inputs or x-values, for which the given function is defined.

The given graph is defined form -3 to positive infinity. The point -3 included in the set of input because there is a closed circle at x=-3.

So, domain of the function are all real numbers greater than or equal to –3.

Therefore the correct option is 4.