What is the probability of rolling a 6 on a dice ?

What describes horizontal cross section of the right rectangle 6m 8m 5m

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x

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.