What should be done to prevent and prepare for new diseases in the future? answer this is a paragraph

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Find the distance between (0,5) & (-4,2)