Kojo wants to be an author. To improve his writing skills, every day after school he writes 3 pages of a story he is
working on. Kojo has been writing his story for d days. He has a total of 81 pages completed.
Write an equation to describe this situation.

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?