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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. 😁

How do u get the first line? x>=t. I understand the rest

Pls help with 13d) and e) and 21 b) 🙏🙏

Oh rip there goes a mark 😨😭

yall for the koalas question did u have to round down or up? I thought since it asked for expected koalas and the answer came to 36.72 u rounded up?