Question 65819
Hi Nathan,
The closure propterty for addition and multiplication states that:
If a and b are real numbers, then a+b and ab are real numbers.
I haven't thought of a reason that it may not apply to subtraction, but I immediately thought of the fact that 0 is a real number, but anything divided by 0 is undefined and does not result in a real number.
Hope that helps.
Happy Calculating, Nathan!!!