12 1/2 + 4 1/2=? ? show work so i can understand. ps do this a common core

Note that:

-12 1/2 + 4 1/2 is the same as 4 1/2 - 12 1/2

1/2 - 1/2 = 0

You are left with: 4 - 12

Simplify

4 - 12 = -8

-8 is your answer

hope this helps

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

answer: you need to organize this better it does not make sense.

step-by-step explanation: ?