Context-Exercise

1. invoke the add function with 2 arguments, 0 and 1
2. invoke the add function within the context of the object named voltron, passing in 2 arguments, 2 and 3 (using call())
3. invoke the add function within the context of the object named optimus, passing in 2 arguments, 20 and 30 (using apply())
4. bind the function add to a new function named calculate with the context of the object bender (using bind())
   invoke the calculate passing in 2 arguments, "drinking " and "beer"