Express Using Positive Exponents $\left( \frac { 1 } { 4 } \right) ^ { - 3 }$

Multiple Choice

Express using positive exponents. Then simplify.
- $\left( \frac { 1 } { 4 } \right) ^ { - 3 }$

A) $- 64$
B) $\frac { 1 } { 64 }$
C) 64
D) $\frac { 1 } { 12 }$