Please help this is the last problem

I uploaded the answer to a file hosting. Here's link:

cutt.ly/tz3yDpb

1. minimum

2. 6400

3. eight

hope this !

6^2 or 36

step-by-step explanation:

6000n

6×1000n

6×10^3 n

so we need 6n need to be a perfect cube

so n has to be 6^2 so that 6n is 6^3

what i'm saying is if you let n be 6^2 you have 6^3×10^3 or 60^3 which is a perfect cube