What are 2 expressions that equal to 19

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

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