Hi$.$ I$\text{'}$m a student of learming hydrodynamics. I$\text{'}$m trying to solve the problem using Bernoulli's formula, but I$\text{'}$m asking because I don't know where I got it wrong during the solution process. I would appreciate it if you could write down the exact solution process of the blanks as well as the detailed solution process of the blanks.

Because it is a problem solving using the Bernoulli formula, we solved the problem under the assumption of steady laminar flow, incompressible fluid. Thank you for your effort! And please answer me in handwriting. please please please