Question

Consider the following relation: {(1, 3), (2, 7), (3, 11), (4, 15)}

The above relation: is a function, or, is not a function

The domain is: {1,2,3,4} or {1,2,3,4,7,11,15} or {3,7,11,15}

The range is: {1,2,3,4} or {1,2,3,4,7,11,15} or {3,7,11,15}

Answer 1

it is: why?
domain: all the input values
range: all the output values