A bronze right circular cone of base radius 4cm and height 9cm and a bronze right circular cylinder of base radius 3cm and height 5cm are melted together and cast into a single solid sphere.
a. (i) Find the total volume of bronze obtained from the cone and the cylinder.
b. (ii) Determine the radius of the sphere formed.
c. (iii) Calculate the curved surface area of the sphere (take π=722).