Algebra-1

To determine which letter could be replaced with -3 in the diagram, let's break it down based on where -3 belongs:

 

-3 is a real number: It must be somewhere in the rational number section (since all integers are rational numbers).

-3 is an integer: It fits inside the "Integers" set, which is a subset of rational numbers.

-3 is not a whole number: Whole numbers are non-negative, and -3 is negative.

 

So, based on these classifications, -3 would fit in...