What is the decimal for 17 40

What is the product of the radical expression. (7-2square root) (8+2 square root)

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

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?