In MLA format for essays how should i say numbers?

Question

if i wanted to say aproximately 25,000 people should i spell it out like twenty five thousand people or 25 thousand or can i just do this 25,000

Answer 1

25,000 because the number is above twenty

Answer 2

I believe the rule is if it's under ten write it out, but if it's more you should write it is a number. So you should just keep it as 25,000.