Help pls. In the circle below, the central angle is measured in radians.

When rounded to the nearest .01 of a centimeter,
the length of arc S is ?? cm?

Astudent simplified a rational expression as shown.

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.