Please let me know what this is

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

The sum of two numbers is 12 and their difference is 18 what are the two numbers

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9