Simplify 9(y + 7)
63y
7y + 9
9y + 63
16y

c 9y +63

Step-by-step explanation:

9times y is 9y and 7 times 9 is 63

(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