I have the answers just not sure how to solve. Any help you can give me will help. Thanks!!

1. Simplify: Root 75x^2y^3 Answer= 5xy root 3y

2. What is the vertex of the parabola represented by g (x) = -2x^2 + 8x + 1
Answer (2,9)

3. Let f (x) = 8 over x-4, find f (-2)
Answer: f (-2) = 4/3

4. Let f (x) = 4 - x and g (x) = x^2 + 1. Find ( f o g) (5)
Answer: -22

1. root(75 x^2 y^3) = root(25 x^2 y^2) root(3y) = root((5xy)^2)root(3y) = 5xy root 3y

3.For this just plug in -2 where you see x.
4. For this, plug in 5 for wherever you see x in g(x), and then use that answer for x in f(x).