Question

is -3 and integer and a rational number?

Answer 1

An integer is defined as:
"Integers are like whole numbers, but they also include negative numbers ... but still no fractions allowed" - Mathisfun
Integers = { ..., -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, ... }
A rational number is defined as: "
A Rational Number is a real number that can be written as a simple fraction (i.e. as a ratio).

Answer 2

Eaxmple for rational number: 1 i a rational number because it can be written as (1/1) in fraction.

-10 is a rational number because it can be written as -(10/1)

I hope this help. :)