The perimeter of one square is given as 4x. its perimeter is equal to the perimeter of a rectangle given as 2.5x + 3.75. what is the perimeter of each figure?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.