1990 - 1, 2, and 3

This new set is from the 1990 test. I'd forgotten how much easier the questions seem to be. What do you think?

Difficulty: Easy.

Difficulty: Easy, but you know someone is going to say 1/13, right?

Difficulty: Easy.

Standard instructions for this series: No calculator allowed. Express answers in reduced form. Rationalize denominators. Radicals must be reduced. All numbers are base ten unless otherwise specified. Do not approximate radicals or π. Leave such answers as 1025π or √39, for example. Source: UVM Math Contest 2013

answer 01, answer 02, answer 03, Published 5/7.