Can some one support me with points? i need support up to 1500 points

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Divide. write in simplest form 41/6 divided by 10

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