Copy and complete each of the Diamond Problems below. The pattern used in the Diamond Problems is shown at right.  

1. 

   Hint (a):

   What two numbers have a product of $0.32$ and a sum of $1.2$? You may have to use a guess and check method.

   Answer (a):

   

2. 

   Hint (b):

   $11+?=25$

   Answer (b):

   

3. 

   Hint (c):

   What is the product and sum of $-9$ and $-7$?

4. 

   Hint (d):

   See part (a).