I need help on 1-6, state the domain, range, and function

Find the equation using the point (4,8)

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

If value of cos330° is √3/2 then find tan165°.