Tom was cooking in his kitchen when accidently the pan caught fire. Suggest which control system is best for responding to this stimulus. Make a path to show how impulses have travelled and he extinguished the fire.
the lengths of the radii of circles form a geometric series. the radius of the first circle is 15cm. the radius decreases by 4/5 of the length of the previous circle. determine the total area of all circles in the series. Give your answer in terms of pi