9 ten thousand ➗10 unit form

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+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