Answer:
19? 21?
Step-by-step explanation:
Answer:
B.) 
Step-by-step explanation:

A negative and a negative equals a positive. Remove parentheses and simplify

Done.
Answer: h=P/mg
Step-by-step explanation:
Answer:
IM TERRIBLE IN GEOMETRY
Step-by-step explanation:
If you draw more of those triangles, there will be 6 that can fit, so find area of 1 triangle and multiply it by 6. Write that number down and then do Pi r squared to find the area of the circle, then do circle area minus triangles area when you get that, divide it by 6. That is the area of the white region so then do Pi R squared again and then subtract the white area from that