Use the Properties of Exponents to Simplify $$z ^ { - 2 / 7 } \cdot z ^ { 3 / 7 }$$

Multiple Choice

Use the properties of exponents to simplify. Write with positive exponents.
- $$z ^ { - 2 / 7 } \cdot z ^ { 3 / 7 }$$

A) $z ^ { 6 / 7 }$
B) $\mathrm { z } ^ { 1 / 7 }$
C) $z ^ { - 1 / 7 }$
D) $\mathrm { z } ^ { 7 / 6 }$