1. The problem statement, all variables and given/known data So I understand how to evaluate P(4 < X < 6) where the probability density function is f(x)=4x I cant seem to understand how to evaluate P(X>6) I would have to do something like [tex]\int^6_\infty 4x [/tex] ... so how do I evaluate it? 2. Relevant equations 3. The attempt at a solution The answer from my book suggests this, after integration = > 2x2 Then 2([tex]\infty[/tex])2 - 2(6)2 my 2([tex]\infty[/tex])2 should evaluate to 1.. however in some other problems when its [tex]\int^4_\infty 4x [/tex] (infinity being -infinity) the - [tex]\infty[/tex] part should end up being zero? I'm sorry if this is something basic but there aren't enough examples in my book.