<span>625/1000 is your answer
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2) 4 = 90
5 = 45
6 = 45
16) this one's a bit long :)
PLEASE READ
I MADE A DUMB MISTAKE WHEN WORKING OUT THE HEIGHT
ITS NOT 8.41 ITS 9
SORRY ABOUT THAT
If you're simplifying, you would get -258 I believe.
It will take them 20 hours, since the question is asking how long it will take them when working together you add each of their hours together,9+11=20