Simplify each expression.

1.  $6 + \left(−2\right)$

   Answer (a):

   $4$

2.  $−7 + \left(−7\right)$

   Answer (b):

   $−14$

3.  $1 − \left(−4\right)$

   Hint (c):

   Remember that subtracting a negative can be thought of as undoing the adding of a negative.

4.  $−6 · 7 + 11 + 1\left(−3\right)$

   Hint (d):

   Circling terms should make this problem easier.

   $( - 6 \cdot 7 ) + ( 11 ) + ( - 3 )$

5.  $5$ groups of $\left(−6\right)$

   Hint (e):

   This is like saying $5\left(−6\right)$.

6.  $−7\left(−4\right)$

   Answer (f):

   $28$