2x^2 + 28x - 96 ac method

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Side xy of triangle xyz is extended to point w, creating a linear pair with ∠wyz and ∠xyz. measure of an exterior angle what is the value of x? 64 80 100 180

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?