An ore sample contains 2,000 milligrams of a radioactive material. it has a half life of 1 day. this means that each day, the amount of material is one half of what it was the day before. how much will be in the sample on the eighth day?

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?