On your paper, sketch the algebra tile shape shown at right. Write expressions for the area and perimeter of the shape. Then calculate the area and perimeter of the shape for each $x\text{-value}$.  

1. $x=9$ cm 

   Hint (a):

   Substitute $9$ cm for $x$ in each expression.

   More Help (a):

   $A=3(9)+3$
   $P=2(9)+10$
   Use the Order of Operations to simplify and calculate the answer.

   Answer (a):

   $A=30$ sq cm
   $P=28$ cm

2. $x=0.5$ cm Hint: Draw a diagram. Does your perimeter expression work? 

   Hint (b):

   

   Answer (b):

   $A=4.5$ sq cm
   $P=14$ cm

3. $x=15$ cm 

   Hint (c):

   See part (a).