If a bank represents deposits with positive numbers and withdrawals as negative numbers, what could (-9) + 40 represent?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

If 3x+8=3x+8 is it one solution or no solution

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