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

1. 

   Step 1 (a):

   Divide $6$ by $-1$.
   $6\div\left(-1\right)=-6$

   Step 2 (a):

   Add $-6$ to $-1$.
   $(-6)+(-1)=-7$

   Answer (a):

   

2. 

   Hint (b):

   $3+?=-5$

3. 

   Hint (c):

   $1.2+?=11.2$

4. 

   Hint (d):

   What two numbers multiplied equal $24$, but equal $10$ when added together?

   Answer (d):