The question is here:
It's a long question and I figured attaching the link here would be better.
I need help with the question on page 4.
The only relevant equation is the integral of Integral[ g(s)ds,s,x-t,x+t]
The Attempt at a Solution
I tried to look at the solutions but I don't understand how to find the boundaries of the integral from the regions.
to be in region 2, the solution says that x+t>1 and -1<x+t<1
why is that ?
how was this derived ?