A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius + (in feet) of the outer ripple is r (t) = 0.2t , where t is the time in seconds after the pebble strikes the water. The area of the circle is given by the function A (r) = Try. a) 2 pts -Find the composition of functions ( A or) (t) . Show one intermediate step. b) 2 pts -Interpret what the function in part a) measures. The function (A or) (t) measures after The symbol for composition of functions o can be found in the Misc folder in the Canvas Equation editor (second row, 7th position)