For the function​ f(x), find all values of a for which​ f(a) is the indicated value. f(x)=12x-6/x f(a)=6

For the function f(x)= -3x + 9 and g(x) = 4x - 1, find fg(2)

Let f(x)=-x2-3x+5. find f(3).

The function f(x) = -0.001922 +0.8444x + 5 models the height of a launched rocket. The function gives the vertical height as a function of the horizontal height in feet. Which are heights that the rocket was at along its path?