Examine the tile pattern below.   

1. On your paper, sketch Figures 4 and 5.

   Hint (a):

   To sketch the next figures in the pattern, you must find out what the pattern is.
   How do the figures change as the pattern continues?

   Answer (a):

   tile
   tile
   tile
   tile
   tile	tile	tile	tile	tile $\space$

   Figure $4$

   tile
   tile
   tile
   tile
   tile
   tile	tile	tile	tile	tile	tile $\space$

   Figure $5$

2. How does the pattern grow? Explain how you know.

   Hint (b):

   See the hints for part (a).

   Answer (b):

   The pattern grows each time by two tiles, one on each side of the figure.

3. How many tiles will there be in Figure 0 (the figure before Figure 1)? Explain how you know.

   Hint (c):

   Once you find the answer, remember to explain how you got to that number of tiles. Also, see part (b).