Help me with these graphs

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters

10x − 5y + 14 = 0 whats the answer pls