Find the slope!! Please

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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 unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters