Michael claims that the whole numbers are closed under subtraction. Stephanie disagrees. Which equation can Stephanie use as a counterexample to show Michael's claim is false?
A. 6-4=2
B. -3-8=-11
C. 4-5=-1
D. 7-(-2)=9
What does "whole numbers are closed under subtraction" mean? The possible answers don't seem wrong at all, but I don't understand what they mean by "closed under subtraction."
A. 6-4=2
B. -3-8=-11
C. 4-5=-1
D. 7-(-2)=9
What does "whole numbers are closed under subtraction" mean? The possible answers don't seem wrong at all, but I don't understand what they mean by "closed under subtraction."