Encuentra el valor de sec A

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Find all solutions for 2y - 4x =2 y = 2x + 1 site: socratic.org

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