Edexcel IGCSE Mathematics A - Paper 3H - 2016 - Unofficial Mark Scheme

It was 4.5cm to the nearest 0.5cm so if you were to convert it, it would become 45mm not cm like you said. Also, as it was to the nearest 0.5cm the upper bound would have been 4.75cm which is not 45.5mm when converted

You were given 4.5cm which you have to convert to MM via the multiplication of 10, giving you 45cm.
The upper bound value of 45 is 45.5, hence you have 45.5MM
Divide this by your MM value, which was 3. This needs to be a lower bound to produce a maximum value and so you should divide by 2.5MM ( question stated 3MM to nearest MILIMETRE).
This would have given you 18

What about volume?

Didn't say 4.5 cm was to the nearest CM that was for the MM value, so it definitely gave 45.5mm

i got 6/21(0.285714) for the probability

Guys, if I found the correct gradient on the exercise where we had to find a parallel line but then somehow messed it up and wrote 3x+4y=11, would I get any marks..? I previously found the correct answer but I unfortunately crossed it off and I'm pretty sure they won't count any of it. I really wanted to do good, damn it!

You were given 4.5cm which you have to convert to MM via the multiplication of 10, giving you 45cm.
The upper bound value of 45 is 45.5, hence you have 45.5MM
Divide this by your MM value, which was 3. This needs to be a lower bound to produce a maximum value and so you should divide by 2.5MM ( question stated 3MM to nearest MILIMETRE).
This would have given you 18

How many marks was the last question worth?

for the probability you had to do all possible orders for picking numbers that total six, there was six possibilitieseach one had a chance of 1/21 so you had to add all 6

I got t=2 for finding the acceleration in the differentiation question, anyone else??

pretty sure thats right except it should be 19 not 11