Arectangle has a length of a cm and a width which is half of the length. given that the rectangle as a perimeter of 240 cm, write down an expression in terms of a for the perimeter of the rectangle, and find the length of the rectangle.

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?