Colton's truck weighs 1 tons. Francine's truck weighs 2 į tons. What is the difference
between the weights of their two trucks?

i think the correct option is the second option.

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.