Rosey waxes 2/5 of a car with a 3/ 8 bottle of wax. What fraction of a bottle will she use to wax the entire car?

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?