Question

I have to use interval notation to answer the question ( attachment )

Answer 1

`\begin{gathered} C\text{ }\cup\text{ D =(}-\infty,2)\text{ U (9, }\infty) \\ C\text{ }\cap\text{ D= }\emptyset \end{gathered}`

Step-by-step explanation.

To determine the set that defines the intersection and union of C and D, we must make a number line:

Therefore, for C U D:

`\begin{gathered} C\text{ }\cup\text{ D =(}-\infty,2)\text{ U (9, }\infty) \\ C\text{ }\cap\text{ D= }\emptyset\text{ }\rightarrow\text{ It is empty, they do not intersect with each other.} \end{gathered}`