Would someone mind telling me how to find the indicated direction in the problem below? Help with (b) would also be greatly appreciated!

(a) Graph the parametrized curve described by x = 2 cos t, y = -sin t, 0≤t≤pi. Indicate the direction in which the curve is traced.

(b) Find a Cartesian equation for the parametrized curve. What portion of the graph of the Cartesian equation is traced by the parametrized curve?

Thanks.