If something starts out costing $500, and then is marked down by 25% on each of three separate occasions, what is the final price

Is this a polynomial function? i need to know asap

If a is a nonzero real number then the reciprocal of a is

About 9% of th population is hopelessly romantic. if 2 people are randomly selected from the population, what is the probability that at least 1 person is hopelessly romantic?