The door of Building #1 is on the right side of this building The door is 4 feet off the ground.
The ramp can be no shorter than 6 feet and no longer than 14 feet
Please help ASAP!

Math it's appreciated. (picture provided)

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters

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