starting with the array numbers = [1,2,3,4,5,6,7,8,9]
- double every number in the array
- return the max value of the array
- return the sum of the array
- return the average of the array
- return only the even numbers from the array
- return every number above 6 from the array
- return an array with only the odd numbers doubled. i.e. [2,2,6,4,10,6,14,8,18]