I cannot see your picture, but if the plane cutting the cylinder is indeed perpendicular to the cylinder's base, then the cross section must be square or rectangular. Going by the shape of most cylinders, I would guess that it is rectangular.
4 dollars flat $4.00
Step-by-step explanation:
1.25x4= 5$ 5$+5$=10$
One way to do this is to notice

Then

We have

and since
has a period of
,

and so

4x^2+9x-(x^2-6x+9)+11
4x^2+9x-x^2+6x-9+11
3x^2+15x+2