323 X 412= 133076
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-3-4-5=-12
-3 and -4
Let first COI=n=3 second COI=n+2=5 third COI=n+4=7 (n)(n+2)=n+4+8 check: n^2+2n=n+12 n^2+n-12=0 -n-12 -n-12 -4^2+(-4)-12=0 n^2+2n-n-12=0 16+(-4)-12=0 n^2+n-12=0 12-12=0 (n+4)(n-3)=0 0=0 n+4=0 n-3= 0 n^2+n-12=0 -4 -4 +3 +3 3^2+3-12=0 n=-4 n=3 9+3-12=0 reject 12-12=0 because is negative and it needs to be positive 0=0
1/3 + 1/4? 1/3 can be changed to 4/12.. 1/4 can be changed to 3/12.. 3/12 + 4/12 = 7/12 you can't simplify 7/12, so your final answer is 7/12.
12 + 23 + 14 + 11 = 60/4 = 15 The average is therefore 15.