–4k + 5 ≤ 21 i need help please

We conclude that:

The number line graph of the solution is also attached below.

Step-by-step explanation:

Given the equation

Subtract 5 from both sides

Simplify

Multiply both sides by -1 (reverse the inequality)

Simplify

Divide both sides by 4

Simplify

Therefore, we conclude that:

The number line graph of the solution is also attached below.

(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

this is answer of 144 cubic meters