Fill in the blanks for the rules for working with exponents:
a. If multiplying terms with the same base, you _________ their exponents.
b. If dividing terms with the same base, you _________ their exponents.
c. If raising a power to a power, you ___________ the exponents.
d. Any number raised to the 0 power is ________.
e. A negative exponent is defined as ________________________________.