Step-by-step explanation:


Use the discramnt formula.

Answer:
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
Step-by-step explanation:
so answer is √2-√6/4
Hope it helps u............
Im not sure wym but i think the answer is 20
You divide 15.75 by .25 and you get 63