Please help, I'm kinda desperate! :(

f(x)=x-4 g(x)=8x+9
find (f+g)(x)

Given the parent function of [tex]f(x)=x^4[/tex], what change will occur when the function is changed to [tex]f(\frac{1}{2} x)[/tex]?

Acircle has a circumference of 28.36 units what is the diameter of the circle

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?