Final answer:
The expression b¹0 / b⁶ can be rewritten as b⁻⁶.
Step-by-step explanation:
The expression b¹0 / b⁶ can be rewritten in the form of bⁿ as b¹0 / b⁶ = b¹0 - 6 = b⁻⁶. The negative exponent indicates that the base should be divided by itself raised to the positive exponent. Therefore, the correct answer is b⁻⁶.