Answer:
Simplify:

Step-by-step explanation:

Oma made a mistake in step B, because she should have divided both sides by b instead of just moving it to the other side. The real next step would look like:
(2A)/b=h
3.14 * 19.311^2 = 60.63654
60.63654 * 19.311 = 1170.95222394
1170.95222394 * 16 = 18744.738366545
<span>18744.738366545
foot^<span>3
</span></span>