Given the code fragment from three files: Which code fragment, when inserted at line 2, enables the code to compile?

Given:

and the code fragment:

What is the result?

Given:

And given the code fragment:

Which two modifications enable the code to print the following output?
Canine 60 Long
Feline 80 Short

You are asked to create a method that accepts an array of integers and returns the highest value from that array.
Given the code fragment:

Which method signature do you use at line n1?

The following grid shows the state of a 2D array:

This grid is created with the following code:

Which line of code, when inserted in place of //line n1, adds an X into the grid so that the grid contains three consecutive X's?