Whose method of composition involved tossing coins and throwing dice?
Would it be reliable to use the simple calibration curve method for the determination of potassium by flame photometry in seawater?
In general, throwing a backup ball may not provide better results than throwing it in the normal manner. The best solution is to talk with your a local proshop operator or instructor to observe your style of bowling to develop a game plan to either change your throwing method or to leverage the existing style.
It depends actually... It is not a must. If you have method in which there are chances of two different types of exceptions being created, then your method should have a throws clause that can throw both types of exceptions. If you feel your code wouldn't throw any exception then you need not have a throws declaration in your method at all....