A cell phone company charges $30.00 for the phone plus a monthly service charge of $20.00. The equation y = 20x + 30 gives the cost y after x months. Which is true of the relationship between x and y?

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

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

The median for the given set of six ordered data values is 29.5 9 12 25 __ 41 48 what is the missing value?