What is the value of the square root of 1/16

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?