Please can any one help me ​

If 1 km = 0.621 miles, how many miles are in a centimeter

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?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?