List 0.33, 4/9, 0.08, 1/7 in order of greatest to least

If given an equation of a line such as -1/2x+6 how would you create an equation of a line parallel and perpendicula to this line that goes through another point such as (4,10)

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

The quadratic function h(t)=-16.1t^2+150 choose the graph representation