Duke's Geosynchronous Satellite

The Duke Communications company wants to put a satellite into a circular geosynchronous orbit over the equator. (Note: this means that the period of the satellite's orbit is one day.) Ignoring perturbations like the moon and the sun, and using $G = 6.67\times10^{-11} \frac{N-m^2}{kg^2}$ and $M_E = 5.98 \times 10^{24} kg$, find:

a) The radius of such an orbit.

b) The velocity of the satellite in the orbit.