Expression in standard form

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the