Final answer:
In mathematics, there are multiple examples of variables where one doubles when the other doubles. Some examples include the relationship between the side length and the area of a square, as well as the relationship between the radius and the circumference of a circle.
Step-by-step explanation:
In mathematics, we can find two variables where one doubles when the other doubles. One example is the relationship between the side length and the area of a square. When the side length of a square doubles, the area of the square becomes four times larger, or doubles twice. Another example is the relationship between the radius and the circumference of a circle. When the radius of a circle doubles, the circumference of the circle also doubles.