I'm very confused on this on my pre ap 7th grade hw. how do i figure this out?

What are the domain and range of f(x)=[1/5]x

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?