Sarah has three times as many pencil he racers as sam together they have 28 erasers how many racers does sarah 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

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

What is 10+10+20 about the origin the square root of a triangle.