Answer:
Johnny is wrong.

Step-by-step explanation:
Johnny is wrong.
A better definition would be:
is the set of all elements that belong to at least one A or B.
So, the elements that belong to both A and B, like c and d in this exercise, also belong to
.
So:

Answer:
they are both 0 since they would not appear on a graph
Step-by-step explanation:
Answer:
2x-6<-18
Step-by-step explanation: