The complete sentence is:
"A relation that assigns to each element x from a set of inputs or domain exactly one element in a..."
First, let's describe what a mathematical relation is.
A relation between two variables maps the element from the set of inputs, also called the domain, into the set of outputs, also called the range.
So we have something like:
y = h(x)
Where the relation h() is mapping the element x into the element y.
Now, the sentence that we need to complete is:
"A relation that assigns to each element x from a set of inputs or ________ exactly one element in a..."
So we need a synonym for the set of inputs, which we already know that is also called the domain, so the complete sentence would be:
"A relation that assigns to each element x from a set of inputs or domain exactly one element in a..."
If you want to learn more about the domain, you can read:
https://brainly.com/question/1770447
