Hey Sean,
Assumptions: The cone is a right circular cone. The ice cream at the top of the cone is a half a sphere.
Cone V = π r2 h/3 (1/2) Sphere V = 4/3 π r3
V= π (8)213/3+ (4/3 π (8)3)/2
871.27 + 1072.33 = 1943.60 in cubic units
Be careful with your order of operations when computing.