which of the following is equal to the expression below ? (6^-7 ) ^3
A(-1/6) ^21
B(1/6 ) ^21
C(1/6) ^-21
D(-1/6 ) ^-21 ?
A(-1/6) ^21
B(1/6 ) ^21
C(1/6) ^-21
D(-1/6 ) ^-21 ?