Chapter 10.7, Problem 43SB

In Problems 43 and 44, the parametric equations of four curves are given. Graph each of them, indicating the orientation.

$C_1:x=t,y=t^2;-4\le t\le 4$

$C_2:x=\cos t,y=1-{\sin }^{2}t;0\le t\le \pi$

$C_3:x=e^t,y=e^{2t};0\le t\le \ln 4$

$C_4:x=\sqrt{t},y=t;0\le t\le 16$