10 x 9 =90 90/2= 45 45x4= 180
i believe its "c" because all of the other options include a but it could be d because there is a way of financing with cash at certain places but its uncommon.
6^2 or 36
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