Margot is walking in a straight line from a point 30 feet due east of a statue in a park toward a point 24 feet due north of the statue. She walks at a constant speed of 4 feet per second. (a) Write parametric equations for Margot's position t seconds after she starts walking. (b) Write an expression for the distance from Margot's position to the statue at time t. (c) Find the times when Margot is 28 feet from the statue.