How many ways can 18 baseball cards be passed out to 2 students?

Answer this question! 30 points and brainliest!

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

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"