Answer:
What do I have to do?? I don't understand
Answer: 119.57 cu. ft.
Step-by-step explanation:
Volume of a hemisphere = (2/3)πr^3
= (2/3) * 22/7 * 3.85^3
Simple,
using the Pythagorean Theorem...

You have the hypotenuse (C) and one of the legs (A)
So, plug in what you know...

144+

=400
Now,isolate


-144 -144
Leaving you with...

So, now,

, to find what b is..
b=16
Thus, your answer.
Try the last one; it doesn't mention anything foreign.