HELP! I'm Stuck On A Problem, And Can't Figure It Out!

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Hello Everyone! I am Miss Ci and I homeschool my younger sister. Today I came across a math problem in class that I'm a little embarrassed to admit that I got stuck on. May someone please explain how to solve this problem or either assist me in the direction on where I can get help solving the problem? I would greatly appreciate it. Thank You!

The Topic At Hand:
Real Number Properties and Axioms

Here is a screenshot of the problem that stomped me today:

prob 2.JPG

To show my appreciation I am willing to transfer 1SBD to the first individual who can correctly assist me in solving the above problem.

(1)Image Source: Google Images | Android Math Apps

HELP! I'm Stuck On A Problem, And Can't Figure It Out! | Ecency