Josiah tells his friends that for there to be snow it has to be 32degeees f. he uses his thermometer outside and sees snow. he finds it is only 34degrees f. what is his percent error

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?