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by law Jnauary 31, they must be mailed or handed out
There are many ratios that form a proportion 5/7. For instance: 5/7 = 10/14 So any ratio that forms a proportion with 5 over 7 is 5k1/(7k2) where k1 = k2, and k1, k2 are any real values.
You can in the UK.
Any envelope can be mailed.
It is only available to teams registered in grades K1&2.