Jeremy has $30. He pays $8 to wash his car. His friend pays back $16 that Jeremy had loaned to him. How much money does Jeremy h
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Natural numbers are not closed under subtraction. In fact, any operation has no solution using natural numbers.
Natural numbers are closed under multiplication. In fact, any operation means to sum
by itself
times, and we already know that natural numbers are closed under sum.
Natural numbers are not closed under division. In fact, if doesn't divide
, any operation
has no solution using natural numbers.