It’s the third one
B=50.27 cm
V=371.97
Answer:
Option C. 
Step-by-step explanation:
we know that
The volume of a cylinder is equal to

we have


substitute


Since it is under 985,000, you would round it down. So your answer rounded to the nearest ten thousand would be 980,000
Sqrt55. Use the pythagorean theorem; 3^2 + x^2 = 8^2
They are not equivalent, try adding in numerical values for x, both do not come out the same.