How much does a glass cube with a side of 5-cm weigh if 1cm of glass weighs 2 2/5 grams?

  300 grams

Step-by-step explanation:

The volume of the glass cube is ...

  V = s³ = (5 cm)³ = 125 cm³

This is 125 times the volume of a 1-cm cube, so the weight is 125 times as much:

  125 × (2 2/5 g) = 300 g

The glass cube weighs 300 grams.

(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

probably the last option

step-by-step explanation: