The teacher has 20 Thanksgiving stickers and 5 of them are scarecrows. What percentage of the stickers are scarecrows?(PLEASE HELP!) :C

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

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