Answer:
The answer is B.
Step-by-step explanation:
x^2-5x = x + 5
(x^2-5x)( x + 5)
x^3 - 25x^2+25x^2-25x
x^3 - 25x
After removing one black marble:
2π
Area = πr^2
= π2^2
= 4π
4π is the area of the whole circle, so divide it in half to get the semicircle.
<u>= 2π</u>
