If I buy an inactivated iPad, can I use on Verizon Wireless LTE?
Yes, it is compatible with Verizon.
All the newer ones will work on Verizon, but older ones could be carrier specific. Which iPad are you getting? Do you have a specific model number?
Also if they are wifi only you can't activate on ANY carrier. You can only use in wifi.
It's an iPad mini 3 wifi plus cellular