How do you write 527,519 in expanded from using exponents

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

Find cot x if sin x cot x csc x = √2

Three runners competed in a race data were collected at each mile mark for each runner if the runner ran at a constant pace the data would be linear