Simplify each expression.

1. $6^5$ 

   Hint (a):

   $6 · 6 · 6 · 6 · 6$

2. $( \frac { 2 } { 3 } ) ^ { 3 }$ 

   Hint (b):

   $\frac{2}{3}\cdot\frac{2}{3}\cdot\frac{2}{3}$

3. $\left(2 + 3\right)^{4}$ 

   Hint (c):

   Following the Order of Operations, first simplify the terms in parentheses.

   $\left(5\right)^{4}$

   More Help (c):

   Then simplify the terms with exponents.

   $5 · 5 · 5 · 5$

   Answer (c):

   $625$

4. $2 ( - \frac { 1 } { 2 } + \frac { 3 } { 4 } ) ^ { 3 }$ 

   Hint (d):

   Follow the Order of Operations.

   Answer (d):

   $\frac{1}{32}$