Question

Please see attached picture of problem I need help with.

Answer 1

Step 1

List the elements of D

`D=\lbrace2,.........\rbrace`

List the elements of E

`E=\lbrace........,8\rbrace`

Find

`D\cap E`
`D\cap E=(1,8]--(\text{what is common\rparen}`

Find

`D\cup E`
`\begin{gathered} D\cup E=(1,\infty)\cup(-\infty,8]--(Listing\text{ all elements in D and E\rparen} \\ D\cup E=(-\infty,\infty) \end{gathered}`

Answers;

`\begin{gathered} \begin{equation*} D\cap E=(1,8] \end{equation*} \\ \begin{equation*} D\cup E=(-\infty,\infty) \end{equation*} \end{gathered}`