A level 8a is very good its actually exeptional performance that a year 11 should be getting but a year 5 (brains). The national for a year 5 is 4c.
For him he is doing fine.
Group 8A elements have 8 valence electrons. This means that the highest occupied energy level in Group 8A elements will have 8 electrons, as the maximum number of electrons in an energy level is 8 based on the octet rule.
It is on the ARCT repertoire.
8a+48b=
The GCF is 8a.
8a-a-a = 6a
8a-3b = 5
8a - 15 = -3 8a = 15 - 3 8a = 12 a = 12/8 = 6/4 = 3/2
6c you nerds out there and the next one is 6b,6a,7c,7b,7a,8c,8b,8a and so on
8A + (8A+8) + (8A+16) = 888 24A + 24 = 888 ===> 24A = 864 ===> A = 36 The multiples are 8A, 8A+8, 8A+16 = 288, 296, 304. Sum = 888.
9a - 8a = a
8a/-9=12 8a=12x-9 8a=-108 a=-108/8 a=-13.5 Hence the required answer is -13.5