Posted by Anonymous on Tuesday, December 8, 2009 at 9:01pm.
Maria is going for a walk. She begins by walking north for 1 km. She then turns and walks east for 22 km, then turns and walk south for 3 km. She walks at a constant 4 km/hr. Express the distance from Maria to her starting point as a multipart function of t, the time she has been walking.

Math  drwls, Tuesday, December 8, 2009 at 9:31pm
During 0 <t < 0.25 h, y = 4t and x = 0
R = Distance from starting point = y
During 0.25 < t < 5.75 h, y = 4 and x = 4(t0.25)
R = sqrt(x^2 + y^2)
You do the last leg. That should give you the idea