Is a parabola a one-to-one function?

no

Step-by-step explanation:

The function f(x)=x2 is not one-to-one because f(2) = f(-2). Its graph is a parabola, and many horizontal lines cut the parabola twice. The function f(x)=x 3, on the other hand, IS one-to-one. If two real numbers have the same cube, they are equal.

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)