Answer:
C
Step-by-step explanation:
The volume of a cone is given by 
The volume of a cylinder is given by 
<em>Where h is the height and r is the radius</em>
The first figure is a cone with height 6 and radius 5, we can put it into the formula and find the volume:

The second figure is a cylinder with height 50 and radius 1, we can put it into the formula and find the volume:

We can see that they are equal. So answer choice C is right.
2x² + 4x + 2
using long division to obtain the quotient
Don't know if it's right, but do let me know! use percentage to visualise your workings. :)
90 cards in total and 30 in each stack