Why staff if your going to remove mackins240 questions then stop its not funny :)

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

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