Rational Expressions, Equations and Functions

What is the removable discontinuity in the rational function listed below? $$f\left(x\right)=\frac{\left(x-7\right)\left(x+5\right)}{\left(x+5\right)\left(x+2\right)}$$   $$x=?$$   Type your answer as an integer that  $$x$$  is equivalent to.

The process of forming a new function from two given functions by performing the two functions in succession is called what?

What can be found by exchanging the domain and range of a function?

One of the steps that may be necessary to simplify the radical expression is what?

If every element of the domain of a function maps to the same value in the range, than it must be what type of function?

If ,which choices below represent equations of the asymptotes of the graph of f(x)?Check all that apply.

For what values of x is the following function undefined? f\left(x\right)=\frac{x^2+2x-3}{x^2-2x}? Select all that appy.