If U = {all positive integers}

1, 2, 3, and etc

Step-by-step explanation: They are 3 type or integers, +, - and 0+ is the set of all positive integers 1, 2, 3 and etc, while - is the set of all negative integers -1, -2, -3, etc. Zero has its own set.

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4