I'm having trouble with last 3 methods? How do I print out only one result either true or false? I tried "return true" and "return false" they don't print out anything. Is cout the only way to display the Boolean value?

Glad you could figure it out.  Just a reminder, in c++ printing a boolean will not print the words true or false,  it will print 0 or 1.  If you want to print text instead, a simple if statement or conditional expression will help.

If I didn't say specifically anything about return types, then you may design the functions any way you wish.

You mean something like int * variable_name ? If so this is how you create a pointer, which we have not really discussed in detail.  Try to avoid using pointers until I go over them in class.