1. Give parametric equations x(t), y(t), and bounds
for t that produce a path from (1,-2) to (-3,5).
2. Give parametric equations x(t), y(t), and bounds for
t that produce the lower half of a circle (centered at the origin)
of radius 7 traversed counterclockwise.
3. Plot the vector field F(x,y) = i + yj for the
points (0,0), (0,3), (0,-3), (2,0), (2,3) and (2,-3).