Which equation shows a correct relation for triangle RSQ? sin(Q) = sin(R)
sin(Q) = cos(R)
tan(Q) = cos(R)
tan(Q) = sin(R)

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

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

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)