Solve the simultaneous questions x+3y=12 5x-y=4

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

Mickey needs to cut pieces of ribbon that are each 1 meter long tie onto balloons. if he has 8 pieces of ribbon that are each 1 dekameter long. how many 1 meter pieces of ribbon can he cut

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.