What is the value of $(-1)^{5}-(-1)^{4}$ ?
(A) -2
(B) -1
(C) 0
(D) 1
(E) 2
When -1 is raised to an even exponent, the result is 1 .

When -1 is raised to an odd exponent, the result is -1 .

Thus, $(-1)^{5}-(-1)^{4}=-1-1=-2$.

ANSWER: (A)