Whole numbers less than zero are called negative integers. The integer zero is neither positive nor negative, and has no sign. Two integers are opposites if they are each the same distance away from zero, but on opposite sides of the number line. Positive integers can be written with or without a sign.
Step-by-step explanation:
there is the link https://www.mathgoodies.com/lessons/vol5/intro_integers
To find the cost per square foot of A you take $450/720ft to get $0.63 per foot and then for B oyu take $525/768ft to get $0.68 per foot so A is cheaper than B
