Which of the following principles of experimental design reduces error due to change by repeating an experiment on different subjects under different conditions? A) Placebo effect B) Replication C) Control D) blindness E) Randomization

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

Item 1 solve for s. s+24=90 −114 −66 66 114

An electrician cuts a 136 foot long piece of cable. one piece is 16 feet less than 3 times the length of the other piece. find the length of each piece