What is an equivalent expression of 28p^9q^-5/12p^-6q^7

Which must be true in order for the relationship △zyv ~ △xwv to be correct? zy ∥ wx ∠z ≅ ∠y and ∠w ≅ ∠x zv ≅ vy and wv ≅ vx ∠z ≅ ∠x and ∠w ≅ ∠y

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?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.