Find the real solution(s) of the equation (x−5)4=256.

Which is an equation for the nth terms of the sequence 12,15,18,21

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

Write the equations in logarithmic form 7^3=343