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Anonymous
yes the abec 13 would be better, but the abec official rating is onle 1,3,5 and 7 so technically abec 13 isn't an official rating
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The sum of 7 & 13 = 7 + 13 = 20
13 = 7 + s(13 - 7) = (7-7) + s6 = s
It is -7/13.
20
13. that's all there is to it. 7(1)+6 7+6 =13 7x1=7 7+6=13 so 13 is your answer :D