You want to decorate your wording studio with famous record album covers. The rectangular region you want to decorate measures 72 in. 63 in. The album covers measure 12 in by 12 in.

First find the area 72*63

A=4536

Then find the area 12*12

A=144

Then divide 4536/144

You would need 31.5 12 by 12in covers to decorate the rectangular region

As for the 6 by 6

You would need 126 album covers

As for the 9 by 9

You would need 51 covers

And as for the 15 by 15

You would need 20.6 covers