PLEASE SOMEONE HELP ME FIGURE OUT THESE 4 Ill give you brainiest!

Answer: 5. 83 1/3*pi, or 261.8 (approx.) 6. 2*pi, or 6.28 (approx.) 7. 42 2/3*pi or 134.04 (approx.) 8. 144*pi or 452.39 (approx.)
Step-by-step explanation:
Volume of a circular cone : pi*r^2*h/3
I applied the formula to find these answers