0.0061
okay idrk what to say now
Circumference of a circle is simply C = πd, d = diameter.
now, we know the diameter is 80, so C = π80, or just 80π.
P - 4.8 ≤ 6
p - 4.8 + 4.8 ≤ 6 + 4.8
p ≤ 10.8
The inequality should be

The sign on the right is only a 'smaller than' sign because he spent less than 180.
On the left, assuming that even if Calvin took nobody (poor Calvin), we should assume that he at least went himself, hence he spent a minimum of $12.
In cylindrical coordinates, the equations of the surfaces become

These surfaces intersect on the cylinder of radius 1 with cross sections parallel to the x,y-plane:

Then in cylindrical coordinates, the volume of the space bounded by these surfaces is
