2n - 4 > 6
+ 4 + 4
2n > 10
2 2
n > 5
If your looking for Standard Form Rewrite it as...
Rounding 1300 unless your talking about the Marianas trench
The plane PRS passes through the points P, R and S. So it contains the line RS. Also the plane QRS passes through the points Q, R and S. So it contains the line RS as well. Since both the planes contain the line RS, the line RS must be the intersection of plane PRS and QRS