Answer:
c. (-∞, 10]
Step-by-step explanation:
A function [tex]f[/tex] from a set [tex]A[/tex] to a set [tex]B[/tex] is a relation that assigns to each element [tex]x[/tex] in the set [tex]A[/tex] exactly one element [tex]y[/tex] in the set [tex]B[/tex]. The set [tex]A[/tex] is the domain (also called the set of inputs) of the function and the set [tex]B[/tex] contains the range (also called the set of outputs). From the figure below, we can see that this function is a parabola that opens downward and whose vertex is [tex](0, 10)[/tex]. Therefore, the range of this function is (-∞, 10]
