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5-9. How do you access the element of array a located at row 2 and column 4?

76-8. When instantiating an array, you can assign the number of elements in the array dynamically, using a variable (as opposed to using a constant). What situation will that be useful? and why?

57-8. Write a method that returns true if an array of Strings contains the String "Hellofalse otherwise.

Where is the error (although this code will compile and run) in this code sequence?
int a[ ] = { 3, 26, 48, 5 };
int b[ ] = { 3, 26, 48, 5 };
if ( a != b )
System.out.println( "Array elements are NOT identical" );

36-8. Where is the error in this code sequence?
double [ ] a = { 3.3, 26.0, 48.4 };
a[4] = 2.5;

A Sequential Search on a sorted array is typically faster than a Sequential Search on an unsorted array. (yes or no)

How do you retrieve the number of elements in an array a?

3-8. An array a has 30 elements; what is the index of its last element?