Which of the following is the recommended data type for the Product_number field in the conversion database?

I am making a Java program to manage my MIS350 class. Here is a section of my code in this program to store student data:  1) Please evaluate the code: is there any potential problem or limitation with the code in my program? Narrative the problem or limitation with details.  2) How do you suggest to fix or improve the code?  3) Provide your fix of the code. Make sure your code will do the same thing like the provided code above.     

State the rate of change of the water depth, including units.  Use proper labels and answer in both exact and approximate form.  

Determine the rate of change of the water depth when the water is 3 ft.

In the balanced chemical equation for the reaction below: ____C5H10 (g) + ___ O2 (g) 

Identify each of the following transformations as a chemical or physical change: burning leaves and melting ice

Fe2(SO4)3 is called  

The formula for a molecule formed from Aluminum and nitrate would be

Potassium has_____________valence electron(s).

The correct name of the compound  NCl3 is