Please help and plase make sure it is right 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

What is the location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3

I’m really confused and need your assist me with this question i’ve never been taught