Please help and thanks

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

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5