Find the value of each variable. write your answers in simplest radical form

Tiara buys the pizza shown below: a circular pizza is shown. the edge of one slice is marked ab. what does the curve ab represent?

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.