What is 3/8+2/5 equal if someone answers can you guys explain it to me

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

Explain how you can use the associative property to evaluate (7x50)x4.

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.