Array Elements « Array « Ruby

1.have an array that contains objects from different classes, not all just one type.
2.Accessing Elements
3.use the at method
4.Access the last element in the array
5.With -1, you access the last element in an array by looping back around with a negative number.
6.To change three of the elements to have German rather than English spelling.
7.With start and length parameters
8.Replacing subarrays with []=
9.Change character case of an element