WILL GUVE BRAINMIEST HURRY PLS

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Can someone me out here and the tell me the greatest common factor

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?