Ah yes ty so much 🙏
Also for the x>= t matter, could it be because in part c) we're integrating a function in terms of t over the bounds 0 to x. Meaning that 0<= t <= x?? I've seen that logic used in some questions.
Yeah but the integral in the middle (the one with e^(-x) has an e in front of the whole integral which u haven't accounted for in the rightmost integral (in the inequality). Cos presumably that e makes the middle integral larger and I don't understand how it can be smaller than the rightmost one...
Also how do u deal with the e at the front of the expression in the middle? Because presumably u need to multiply the whole inequality by e as well.
Thanks btw ur help v much appreciated. 😁