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I have no idea on D. Sorry. I hope this helps. They may not be right I didn’t quite understand the directions.
For the reciprocal, you swap numerator and denominator.
a. The reciprocal of
is 
To rationalize the irrational denominator, multiply numerator and denominator by the radical, then simplify.
b.
a. The reciprocal of
To rationalize the irrational denominator, multiply numerator and denominator by the radical, then simplify.
b.