Triangle A E C is shown. Line segment B D is drawn near point C to form triangle B D C. Which piece of additional information can be used to prove △CEA ~ △CDB?

∠BDC and ∠AED are right angles
AE ≅ ED
△BDC is a right triangle
∠DBC ≅ ∠DCB

Can someone me and do the problem plz so i can understand it more better

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

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?