Using (__+__i)(__+__i) make an expression that is equivalent to 3+36i

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

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?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.