(Brainliest) can someone answer this

a. 3n + 15

b. 2x + 27

c. 2x + 15

Step-by-step explanation:

a. n + n + n + 15 = 3n + 15

b. 17 + x + x + 10 = 2x + 27

c. 5 + 5 + 5 + 2x = 2x + 15

(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

your answer would be 12