I need more details pleaseee :))
That on the Oregon trail what? what quotes?
Answer: On the Northern horizon
Explanation:
If the star is directly overhead when you stand at the North Pole, it will sink further and further the more you move south towards the equator due to the earth's curve. When you get to the equator, the star will ideally sit right on the northern horizon.
After one crosses the equator however, the star will disappear from view. It is therefore not possible to see this star from anywhere south of the Equator to the South Pole.
1. Using washers, the volume is given by the integral
We're using washers whose centers depend on the value of 
, hence we integrate with respect to
2. The area of the given region is given by the integral
To compute the integral, first consider the substitution 
, or 
so that 
. Then 
and 
, so the integral is equivalently
Integrate by parts, taking
so that
and 
, so the area is
For the remaining integral, substitute 
, so that 
. Then 
and 
:
(notice that the integral is improper)
