Aubrey's dinner costed $85 she tips the waiter 30% how much did Aubrey tip for the waiter

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 radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Rewrite so the subject can be y in the formula d=m-y/y+n