Aset of numbers is shown:

{0, 2.6, 4.2, 5, 10, 15}

which of the following shows all the numbers from the set that make the inequality 5x + 3 ≥ 28 true?

{10, 15}
{0, 2.6, 15}
{5, 10, 15}
{0, 2.6, 4.2, 5}

i am not really sure but i think it is 5,10,15

(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