I am working on my final exam study guide for college algebra and have a few I need help with.

1 "Fill in the blank. Given that f(x) = -4x-2 and g(x)=x^2=9. (fog)(-9)= ?

2 "Find the inverse of the funtion f(x)= 3x-5/6. Then Fill in the blank below. F^-1(x)= ?

3 The intensity of illumination from a light source varies inversley with square of the distance from the source. Suppose that a reading lamp has an intensity of 5000 lumens at a distance of 4 feet.

The intesnity of the lamp is how many lumens at a distance of 2 feet?

The intensity of the lame is 300 lumens at a distnace of how many feet?