Answer:
C
Step-by-step explanation:
Equation:

Oh yay, proportional thinking! (Vicious sarcasm). Alright, let's do this:
Volume of the cylinder = <span>π(h)r^2
New volume = </span><span>π(h/3)(4r)^2
= (1/3)</span><span>π(h)(16r^2)
=16*(1/3)</span><span>π(h)r^2
=(16/3)</span><span>π(h)r^2
Therefore, it's D. Though it's spelled pi, and you should really use the ^ symbol. </span>
First get a common denominator. (3x*2)
x(x-8) -3(3x)
-------------------
3x^2
x^2 - 8x - 9x
------------------
3x^2
x^2 - 17x
--------------
3x^2
The first one is correct
The answer would be C , ending with 33
20x = 2*100
x = 10 ml (amt of 30% solution needed)
100-x = 90 ml (amt of 10% solution needed)
Very hard but I hope it helps