If the temperature drops 7f to -17f how much did the temperature decrease

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

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