Ty takes one hour to read 35 pages, 2 hours to read 70 pages, and 3 hours to read 105 pages if the relationship is not proportional, explain?

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?