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Could someone explain how to solve to this problem?

 
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I have no idea. I'd really appreciate some insight on how to solve it:

How would you refer to the last element in array A declared as

int[] A = { 1, 3, -4, 7 };
 
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or more general:
 
kenny gill
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but what is it asking and how did you figure out that answer?
 
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Java arrays start at index 0, so in your example A[0] == 1

A.length returns the true length, in this case 4, so you must subtract 1 to get the last entry.

TIP: Be careful if length == 0, since you will then try to index A[-1] which will fail.

WP
 
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To learn what exactly arrays are and how they work, see Arrays in Oracle's Java Tutorials.
 
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