Which of the following best describes the complement of this event? A student makes straight As.

A student makes some As and some Bs.
A student makes all As
A student receives Bs, Cs, Ds, and Fs.
A student makes some combination of As, Bs, Cs, Ds, and Fs.

-I know it isn't c

Find the domain of the following expression: 1/(√x)-2

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

What is the slope of the line that contains the points (-5, 6) and (14. - 7)?