If R is inversely proportional to S and r=15 when S =12 what is the value of S when R =60

Which expression gives you the distance between the points (5,1)and(9,-6)

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

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.