What is the amplitude of the function f(x)= 6sin(3x)?

What is the result of adding the system of equations? 2x+y=4 3x-y=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

Which point has an coordinates of (2,0) ? a