Hii, could you please check if my solutions are correct? I followed the instructions given in the pp ...

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Hii, could you please check if my solutions are correct? I followed the instructions given in the ppt slides from my teacher. I'm especially unsure about question 2. I think I did it correctly since I used the method on slide 2, but some classmates calculated 0.3+0.4= 0.7 as the absolute error instead. I’m not sure if I’m wrong, but it clearly says to combine the squares of the absolute errors when quantities are added?? So idk Thank youu