After buying five coloring books that cost $3 each, Mary had %8.50 left. How much money did she have at first

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?

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.