If –1 is a root of f(x), which of the following must be true?
a factor of f(x) is (x – 1).
a factor of f(x) is (x + 1).
both (x – 1) and (x + 1) are factors of f(x).
neither (x – 1) nor (x + 1) is a factor of f(x).

Atown recently dismissed 5 employees in order to meet their new budget reductions. the town had 5 employees over 50 years of age and 19 under 50. if the dismissed employees were selected at random, what is the probability that exactly 2 employees were over 50? express your answer as a fraction or a decimal number rounded to four decimal places.