For this case we have that by definition, 1 foot equals 12 inches.
So:
[tex]3 \ ft = 36 \ in\\7 \ ft = 84 \ in[/tex]
So, the area of the Zoes carpet is:
[tex]A = 36 * 84 = 3024 \ in ^ 2[/tex]
If the cardboard pieces are[tex]6 \ in\ by\ 6 \ in[/tex], then the area is:
[tex]36 \ in ^ 2[/tex]
To indicate the number of necessary pieces we divide:
[tex]\frac {3024} {36} = 84[/tex]
Thus, 84 pieces of cardboard are needed
Answer:
84
