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

1. 

   Hint (a):

   What number multiplied by $−5$ is equal to $−20$? Add the number you just got to $−5$ in order to fill the sum box.

   Answer (a):

   See the diamond below.

   

2. 

   Hint (b):

   Since you have both numbers, you just have to multiply them and add them to fill the other boxes.

3. 

   Hint (c) and (d):

   For parts (c) and (d), think about what two numbers could multiply to the given product and add to the given sum.
   These numbers will fill the empty boxes.