BRAINLIEST to correct answer!

Each circle contains shapes that all share at least one characteristic. Some shapes are contained in more than one circle because they share more than one characteristic.

The distance between any point of the circle and the centre is called the radius. All these circles have one.

Hope this helps!

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

what is the original number? you forgot to add it.