Aregular hexagon rotates counterclockwise around its center. it turns through angles greater than 0° and less or equal to 360°. at how many different angles of a hexagon map onto itself?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

What is the difference between the equations of a vertical and a horizontal line?

How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60 mi/hr? the final answer is supposedly 21,609 but i have no idea how to get that, show work : )