X:x is a square number and 20<x <100​

As the provided trinomial is x^2 + 20x - 100, it is not a perfect square trinomial.

-4

step-by-step explanation:

do 6-10=

if u need it to be negative.

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.