Arectangular picture measuring 4 in. by 8 in. is surrounded by a frame with uniform width x. write a quadratic function in standard form to show the combined area of the picture and frame.

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life b = 2. if 100 of these switches are installed in dif- ferent systems, what is the probability that at most 30 fail during the first year?